Fedora 41 : The cirq python package cannot be install - build errors

Today, I tried to use cirq python package on Fedora 41. This need the python version 3.12.

root@localhost:/home/mythcat# dnf install python3.12.x86_6c

I got some errors because ask me to install the rust:

root@localhost:/home/mythcat# curl https://sh.rustup.rs -sSf | sh
info: downloading installer

Welcome to Rust!

This will download and install the official compiler for the Rust
programming language, and its package manager, Cargo.

Rustup metadata and toolchains will be installed into the Rustup
home directory, located at:
...
Rust is installed now. Great!

To get started you may need to restart your current shell.
This would reload your PATH environment variable to include
Cargo's bin directory ($HOME/.cargo/bin).

To configure your current shell, you need to source
the corresponding env file under $HOME/.cargo.

This is usually done by running one of the following (note the leading DOT):
. "$HOME/.cargo/env"            # For sh/bash/zsh/ash/dash/pdksh
source "$HOME/.cargo/env.fish"  # For fish

These are the next steps I used:

root@localhost:/home/mythcat# pip install --upgrade pip
...
root@localhost:/home/mythcat# pip install maturin
...
root@localhost:/home/mythcat# pip install cirq
...
Collecting cirq
  Using cached cirq-1.4.1-py3-none-any.whl.metadata (7.4 kB)
...
        cargo:rerun-if-env-changed=PYO3_USE_ABI3_FORWARD_COMPATIBILITY
      
        --- stderr
        error: the configured Python interpreter version (3.13) is newer than PyO3's maximum supported version (3.12)
        = help: please check if an updated version of PyO3 is available. Current version: 0.20.3
        = help: set PYO3_USE_ABI3_FORWARD_COMPATIBILITY=1 to suppress this check and build anyway using the stable ABI
      💥 maturin failed
        Caused by: Failed to build a native library through cargo
        Caused by: Cargo build finished with "exit status: 101": `env -u CARGO PYO3_ENVIRONMENT_SIGNATURE="cpython-3.13-64bit" PYO3_PYTHON="/usr/bin/python3" PYTHON_SYS_EXECUTABLE="/usr/bin/python3" "cargo" "rustc" "--features" "pyo3/extension-module" "--message-format" "json-render-diagnostics" "--manifest-path" "/tmp/pip-install-v0zuc831/quil_ebc006157dbd433dbc0890811ee80748/quil-py/Cargo.toml" "--release" "--lib" "--crate-type" "cdylib"`
      Error: command ['maturin', 'pep517', 'build-wheel', '-i', '/usr/bin/python3', '--compatibility', 'off'] returned non-zero exit status 1
      [end of output]
  
  note: This error originates from a subprocess, and is likely not a problem with pip.
  ERROR: Failed building wheel for quil
Failed to build quil
ERROR: ERROR: Failed to build installable wheels for some pyproject.toml based projects (quil)

Not working ...

Fedora 41 : Error gio default application for image.

I run today an old python script in my Fedora 41 to create an image and the result after running was:

mythcat@localhost:~$ python test_001.py 
gio: file:///tmp/tmpwy1k4wyo.PNG: Failed to find default application for content type ‘image/png’

This can be fixed with an default application for images like feh:

$ sudo dnf5 install feh

Fedora 41 : solving conky default configuration in openbox environment.

I installed Conky on an openbox environment and found an error, it doesn't display upload and download from the network correctly.

I had to use the ifconfig command to see the network interface and then I had to modify the default file.

The default configuration file can be found and edited with any text editor:

[root@fedora mythcat]# nano /etc/conky/conky.conf

Here's how it looks functionally.

-- Conky, a system monitor https://github.com/brndnmtthws/conky
--
-- This configuration file is Lua code. You can write code in here, and it will
-- execute when Conky loads. You can use it to generate your own advanced
-- configurations.
--
-- Try this (remove the `--`):
--
--   print("Loading Conky config")
--
-- For more on Lua, see:
-- https://www.lua.org/pil/contents.html

conky.config = {
    alignment = 'top_left',
    background = false,
    border_width = 1,
    cpu_avg_samples = 2,
    default_color = 'white',
    default_outline_color = 'white',
    default_shade_color = 'white',
    double_buffer = true,
    draw_borders = false,
    draw_graph_borders = true,
    draw_outline = false,
    draw_shades = false,
    extra_newline = false,
    font = 'DejaVu Sans Mono:size=12',
    gap_x = 60,
    gap_y = 60,
    minimum_height = 5,
    minimum_width = 5,
    net_avg_samples = 2,
    no_buffers = true,
    out_to_console = false,
    out_to_ncurses = false,
    out_to_stderr = false,
    out_to_x = true,
    own_window = true,
    own_window_class = 'Conky',
    own_window_type = 'desktop',
    show_graph_range = false,
    show_graph_scale = false,
    stippled_borders = 0,
    update_interval = 1.0,
    uppercase = false,
    use_spacer = 'none',
    use_xft = true,
}

conky.text = [[
${color grey}Info:$color ${scroll 32 Conky $conky_version - $sysname $nodename $kernel $machine}
$hr
${color grey}Uptime:$color $uptime
${color grey}Frequency (in MHz):$color $freq
${color grey}Frequency (in GHz):$color $freq_g
${color grey}RAM Usage:$color $mem/$memmax - $memperc% ${membar 4}
${color grey}Swap Usage:$color $swap/$swapmax - $swapperc% ${swapbar 4}
${color grey}CPU Usage:$color $cpu% ${cpubar 4}
${color grey}Processes:$color $processes  ${color grey}Running:$color $running_processes
$hr
${color grey}File systems:
 / $color${fs_used /}/${fs_size /} ${fs_bar 6 /}
${color cyan}Networking:
${color grey}Up: ${upspeed ens1} ${color grey} - Down: ${downspeed ens1}

$hr
${color grey}Name              PID     CPU%   MEM%
${color lightgrey} ${top name 1} ${top pid 1} ${top cpu 1} ${top mem 1}
${color lightgrey} ${top name 2} ${top pid 2} ${top cpu 2} ${top mem 2}
${color lightgrey} ${top name 3} ${top pid 3} ${top cpu 3} ${top mem 3}
${color lightgrey} ${top name 4} ${top pid 4} ${top cpu 4} ${top mem 4}
]]

Fedora 40 : Fedora CoreOS - part 001.

The documentation for Fedora 40 CoreOS can be found on the official webpage.

I download the fedora-coreos-40.20240331.1.0-virtualbox.x86_64.ova file.

You can use double click to open with the VirtualBox application, see the next screenshot:

Fedora use ssh keys and a user named core, use these steps from the official webpage to change the password for this user.

The result will be this:

You need to use these steps to create a password based on the butane and ignition software to login with the ssh-rsa.

Fedora 40 : Fix emergency run mode - part 001.

Run this commands to see errors and all failed systemd units:

[root@fedora mythcat]# dmesg | grep err
[root@fedora mythcat]# systemctl status --failed --all

If you get an error like this:

Recovery unable to mount /home

... check the /etc/fstab file to see how your home is set.

Fedora 39 : Install and fix error with dotnet and copr.

Copr is an easy-to-use automatic build system providing a package repository as its output.

Free/Open source software that is harder to include in Fedora (usually because it is developed in a way that makes it difficult to package while implementing the Fedora packaging guidelines) is temporarily provided in an extra COPR repository, see the official webpage.

I tried to install dotnet following a tutorial on Fedora Magazine:

# dnf copr enable @dotnet-sig/dotnet

I obviously received errors related to copr, because is not install and I used Fedora 39, since Fedora 39 is still Rawhide.

I try to install copr with dnf5:

# dnf5 install copr

I got some errors on python-request-2.28.2-2.fc39.noarch conflicts with new one requested by dnf5 and I remove this package and I let to install the new one.

I try again with same command:

# dnf5 install copr

The next command was:

$ sudo dnf copr enable @dotnet-sig/dotnet fedora-38-x86_64

This allow me to use fedora-38-x86_64 and warn me about copr.

Enabling a Copr repository. Please note that this repository is not part
of the main distribution, and quality may vary ...

The last one is to install .NET Core:

# dnf5 install dotnet

This install all packages for .NET Core with SDK version 6.0 .

I tested with a simple project:

$ dotnet new console -o mythcat_console
$ cd mythcat_console
$ dotnet run 
Hello, World!

This is the way that can use Fedora packages with copr.

Fedora 31 : Can be better? part 004.

The common question of any Fedora Linux user: Can be better?.
Yes, we can fix some common errors...
This is a common error generated by the GTK on Fedora distro applications:

[mythcat@desk bin]$ ./studio.sh 

(java:12631): Gtk-WARNING **: 11:45:47.061: Unable to locate theme engine in module_path: "murrine",

(java:12631): Gtk-WARNING **: 11:45:47.061: Unable to locate theme engine in module_path: "murrine",

(java:12631): Gtk-WARNING **: 11:45:47.106: Unable to locate theme engine in module_path: "murrine",
...

First, find the running GUI environment from the terminal:

[mythcat@desk ~]$ echo $XDG_CURRENT_DESKTOP
X-Cinnamon

This allows us to know that the issue may be a GTK theme package.

[root@desk bin]# dnf install gtk-murrine-engine.x86_64
Last metadata expiration check: 0:45:00 ago on Mon 06 Jan 2020 11:14:27 AM EET.
Dependencies resolved.
...
Installed:
  gtk-murrine-engine-0.98.2-17.fc31.x86_64                                      

Complete!

Now the Android Studio works well without warning errors:

[mythcat@desk bin]$ ./studio.sh 
Jan 06, 2020 12:00:51 PM java.util.prefs.FileSystemPreferences$1 run
INFO: Created user preferences directory.
...

The saga of build Librelancer over Mono, NuGET and Cake.

I wrote this article because it is a good way to understand beyond the errors encountered for Mono, NuGet and Cake.
I started the day with Fedora 29 installing the old Librelancer game:
Librelancer is a cross-platform, open source game engine re-implementing the 2003 space trading and combat game Freelancer. The engine comes with an editor for several of the game's file formats called LancerEdit.
See the official webpage.
Some errors are temporarily fixed, see:

TERM=xterm.

This error refers an issue open on Feb 13,2018,12:52 PM GMT+2, see here.
However, this is a great way to go through Fedora installations to avoid searching for GitHub issues and issues.
The default install of Cake with the version 0.30.0 will not solve the last error:

[root@desk Librelancer]# nuget  install Cake -Version 0.30.0 
Installing 'Cake 0.30.0'.
Successfully installed 'Cake 0.30.0'. 

Let's hope that problems will solve with time.
Below are the correct steps for going through the installation until the last error.

[mythcat@desk ~]$ git clone --depth=50 --branch=master https://github.com/Librelancer/Librelancer.git 
Cloning into 'Librelancer'...
remote: Enumerating objects: 3085, done.
remote: Counting objects: 100% (3085/3085), done.
remote: Compressing objects: 100% (1414/1414), done.
remote: Total 3085 (delta 2131), reused 2295 (delta 1639), pack-reused 0
Receiving objects: 100% (3085/3085), 7.97 MiB | 2.79 MiB/s, done.
Resolving deltas: 100% (2131/2131), done.
Checking out files: 100% (863/863), done.
[mythcat@desk ~]$ cd Librelancer/
[mythcat@desk Librelancer]$ ll
total 48
-rw-rw-r--.  1 mythcat mythcat 4912 Dec  3 11:23 build.cake
-rw-rw-r--.  1 mythcat mythcat 7439 Dec  3 11:23 build.ps1
-rwxrwxr-x.  1 mythcat mythcat 3210 Dec  3 11:23 build.sh
-rw-rw-r--.  1 mythcat mythcat   33 Dec  3 11:23 cake.config
-rw-rw-r--.  1 mythcat mythcat 1029 Dec  3 11:23 CMakeLists.txt
-rw-rw-r--.  1 mythcat mythcat 2768 Dec  3 11:23 Credits.txt
drwxrwxr-x.  4 mythcat mythcat   87 Dec  3 11:23 deps
drwxrwxr-x.  4 mythcat mythcat 4096 Dec  3 11:23 editoricons
drwxrwxr-x. 12 mythcat mythcat  208 Dec  3 11:23 extern
-rw-rw-r--.  1 mythcat mythcat 1166 Dec  3 11:23 LICENSE
-rw-rw-r--.  1 mythcat mythcat 1877 Dec  3 11:23 README.md
drwxrwxr-x.  2 mythcat mythcat   75 Dec  3 11:23 scripts
drwxrwxr-x. 15 mythcat mythcat 4096 Dec  3 11:23 src
drwxrwxr-x.  2 mythcat mythcat   29 Dec  3 11:23 tools

[mythcat@desk Librelancer]$ git submodule update --init --recursive
Submodule 'extern/BulletSharpPInvoke' (https://github.com/AndresTraks/BulletSharpPInvoke) registered for path 
'extern/BulletSharpPInvoke'
Submodule 'extern/Collada141' (https://github.com/Librelancer/Collada141) registered for path 
'extern/Collada141'
Submodule 'extern/FontConfigSharp' (https://github.com/CallumDev/FontConfigSharp.git) registered for path 
'extern/FontConfigSharp'
Submodule 'extern/ImGui.NET' (https://github.com/mellinoe/ImGui.NET) registered for path 'extern/ImGui.NET'
Submodule 'extern/SharpFont' (https://github.com/Robmaister/SharpFont.git) registered for path 'extern/SharpFont'
Submodule 'extern/StbSharp' (https://github.com/rds1983/StbSharp) registered for path 'extern/StbSharp'
Submodule 'extern/bullet3' (https://github.com/bulletphysics/bullet3) registered for path 'extern/bullet3'
Submodule 'extern/cimgui' (https://github.com/Extrawurst/cimgui) registered for path 'extern/cimgui'
Submodule 'extern/lidgren-network-gen3' (https://github.com/lidgren/lidgren-network-gen3) registered for path 
'extern/lidgren-network-gen3'
Submodule 'extern/nvidia-texture-tools' (https://github.com/castano/nvidia-texture-tools) registered for path 
'extern/nvidia-texture-tools'
Cloning into '/home/mythcat/Librelancer/extern/BulletSharpPInvoke'...
Cloning into '/home/mythcat/Librelancer/extern/Collada141'...
Cloning into '/home/mythcat/Librelancer/extern/FontConfigSharp'...
Cloning into '/home/mythcat/Librelancer/extern/ImGui.NET'...
Cloning into '/home/mythcat/Librelancer/extern/SharpFont'...
...
[mythcat@desk Librelancer]$ export GITHUB_TOKEN=[secure]
Check your mono version 
[mythcat@desk Librelancer]$ mono --version
Mono JIT compiler version 4.8.0 (Stable 4.8.0.520/8f6d0f6 Wed Sep 20 21:27:10 UTC 2017)
Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
    TLS:           __thread
    SIGSEGV:       normal
    Notifications: epoll
    Architecture:  amd64
    Disabled:      none
    Misc:          softdebug 
    LLVM:          supported, not enabled.
    GC:            sgen

[root@desk Librelancer]# rpm --import https://packages.microsoft.com/keys/microsoft.asc
[root@desk Librelancer]# wget -q https://packages.microsoft.com/config/fedora/27/prod.repo
[root@desk Librelancer]# ls
build.cake  cake.config     deps         LICENSE    scripts
build.ps1   CMakeLists.txt  editoricons  prod.repo  src
build.sh    Credits.txt     extern       README.md  tools
[root@desk Librelancer]# vim prod.repo 
[root@desk Librelancer]# mv prod.repo /etc/yum.repos.d/microsoft-prod.repo
[root@desk Librelancer]# chown root:root /etc/yum.repos.d/microsoft-prod.repo
[root@desk Librelancer]# dnf update
packages-microsoft-com-prod                      48 kB/s | 156 kB     00:03    
Last metadata expiration check: 0:00:01 ago on Mon 03 Dec 2018 11:52:11 AM EET.
Dependencies resolved.
Nothing to do.
Complete!

[root@desk Librelancer]# dnf search dotnet-sdk
Last metadata expiration check: 0:01:05 ago on Mon 03 Dec 2018 11:52:11 AM EET.
=========================== Name Matched: dotnet-sdk ===========================
dotnet-sdk-2.1.x86_64 : Microsoft .NET Core SDK 2.1.500 2.1.500
dotnet-sdk-2.1.200.x86_64 : Microsoft .NET Core SDK - 2.1.200 2.1.200
dotnet-sdk-2.1.201.x86_64 : Microsoft .NET Core SDK - 2.1.201 2.1.201
dotnet-sdk-2.1.202.x86_64 : Microsoft .NET Core SDK - 2.1.202 2.1.202
dotnet-sdk-2.1.300-rc1-008673.x86_64 : Microsoft .NET Core SDK 2.1.300 - rc1
                                     : 2.1.300-rc1-008673

[root@desk Librelancer]# dnf install dotnet-sdk-2.1.202.x86_64 
Last metadata expiration check: 0:02:18 ago on Mon 03 Dec 2018 11:52:11 AM EET.
Dependencies resolved.
================================================================================
 Package                 Arch    Version     Repository                    Size
================================================================================
Installing:
 dotnet-sdk-2.1.202      x86_64  2.1.202-1   packages-microsoft-com-prod   96 M
Installing dependencies:
 aspnetcore-store-2.0.0  x86_64  2.0.0-1     packages-microsoft-com-prod   24 M
 aspnetcore-store-2.0.3  x86_64  2.0.3-1     packages-microsoft-com-prod  7.9 M
 aspnetcore-store-2.0.5  x86_64  2.0.5-1     packages-microsoft-com-prod  1.6 M
 aspnetcore-store-2.0.6  x86_64  2.0.6-1     packages-microsoft-com-prod  9.3 M
 aspnetcore-store-2.0.7  x86_64  2.0.7-1     packages-microsoft-com-prod   24 k
 aspnetcore-store-2.0.8  x86_64  2.0.8-1     packages-microsoft-com-prod  8.5 M
 aspnetcore-store-2.0.9  x86_64  2.0.9-1     packages-microsoft-com-prod  956 k
 dotnet-host             x86_64  2.1.6-1     packages-microsoft-com-prod   45 k
 dotnet-hostfxr-2.0.9    x86_64  2.0.9-1     packages-microsoft-com-prod  182 k
 dotnet-runtime-2.0.9    x86_64  2.0.9-1     packages-microsoft-com-prod   24 M

Transaction Summary
================================================================================
Install  11 Packages

Total download size: 173 M
Installed size: 173 M
Is this ok [y/N]: y
...
Complete!

This will fix a bug : 
Unhandled Exception:
System.TypeInitializationException: The type initializer for 'System.Console' threw an exception.
[mythcat@desk Librelancer]$ TERM=xterm


[mythcat@desk Librelancer]$ ./build.sh 
Could not load file or assembly 'Microsoft.Build.Utilities.v4.0, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.
Could not load file or assembly 'Microsoft.Build.Utilities.v4.0, Version=4.0.0.0, Culture=neutral, 
PublicKeyToken=b03f5f7f11d50a3a' or one of its dependencies.

[root@desk Librelancer]# dnf install nuget.x86_64 

The dotnet come with this:

[root@desk Librelancer]# dotnet --info
.NET Core SDK (reflecting any global.json):
 Version:   2.1.500
 Commit:    b68b931422

Runtime Environment:
 OS Name:     fedora
 OS Version:  29
 OS Platform: Linux
 RID:         fedora.29-x64
 Base Path:   /usr/share/dotnet/sdk/2.1.500/

Host (useful for support):
  Version: 2.1.6
  Commit:  3f4f8eebd8

.NET Core SDKs installed:
  2.1.202 [/usr/share/dotnet/sdk]
  2.1.500 [/usr/share/dotnet/sdk]

.NET Core runtimes installed:
  Microsoft.AspNetCore.All 2.1.6 [/usr/share/dotnet/shared/Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.6 [/usr/share/dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.0.9 [/usr/share/dotnet/shared/Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.1.6 [/usr/share/dotnet/shared/Microsoft.NETCore.App]

To install additional .NET Core runtimes or SDKs:
  https://aka.ms/dotnet-download

Let's test again:
[mythcat@desk Librelancer]$ ./build.sh 
Feeds used:
  https://api.nuget.org/v3/index.json

Restoring NuGet package Cake.0.30.0.
WARNING: Unable to find version '0.30.0' of package 'Cake'.
  https://api.nuget.org/v3/index.json: Unable to load the service index for source https://api.nuget.org/v3/index.json.
  An error occurred while sending the request
  Error: TrustFailure (Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED)
  Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED

Unable to find version '0.30.0' of package 'Cake'.
  https://api.nuget.org/v3/index.json: Unable to load the service index for source https://api.nuget.org/v3/index.json.
  An error occurred while sending the request
  Error: TrustFailure (Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED)
  Ssl error:1000007d:SSL routines:OPENSSL_internal:CERTIFICATE_VERIFY_FAILED

Could not restore NuGet tools.

[root@desk Librelancer]# cat /etc/ssl/certs/* >ca-bundle.crt
[root@desk Librelancer]# TERM=xterm
[root@desk Librelancer]# cert-sync ca-bundle.crt
Mono Certificate Store Sync - version 4.8.0.0
Populate Mono certificate store from a concatenated list of certificates.
Copyright 2002, 2003 Motus Technologies. Copyright 2004-2008 Novell. BSD licensed.

Importing into legacy system store:
I already trust 0, your new list has 129
Certificate added: CN=ACCVRAIZ1, OU=PKIACCV, O=ACCV, C=ES
Certificate added: C=ES, O=FNMT-RCM, OU=AC RAIZ FNMT-RCM
Certificate added: C=IT, L=Milan, O=Actalis S.p.A./03358520967, CN=Actalis Authentication Root CA
Certificate added: C=SE, O=AddTrust AB, OU=AddTrust External TTP Network, CN=AddTrust External CA Root
...
129 new root certificates were added to your trust store.
Import process completed.
[root@desk Librelancer]# rm ca-bundle.crt
rm: remove regular file 'ca-bundle.crt'? y

[mythcat@desk Librelancer]$ ./build.sh 
Feeds used:
  https://api.nuget.org/v3/index.json

Restoring NuGet package Cake.0.30.0.
  GET https://api.nuget.org/v3-flatcontainer/cake/0.30.0/cake.0.30.0.nupkg
  OK https://api.nuget.org/v3-flatcontainer/cake/0.30.0/cake.0.30.0.nupkg 53ms
Installing Cake 0.30.0.
Adding package 'Cake.0.30.0' to folder '/home/mythcat/Librelancer/tools'
Added package 'Cake.0.30.0' to folder '/home/mythcat/Librelancer/tools'
Install failed. Rolling back...
Error: One or more errors occurred.
    Could not load type 'NuGet.Packaging.PackageArchiveReader' from assembly 'NuGet.Packaging, 
Version=4.7.0.5, Culture=neutral, PublicKeyToken=31bf3856ad364e35'.

Fedora 28 : Fix XFS internal error XFS_WANT_CORRUPTED_GOTO .

It is a common kernel error created under certain predefined conditions.
...kernel: XFS internal error XFS_WANT_CORRUPTED_GOTO...

# xfs_repair -L /dev/mapper/fedora-root
# xfs_repair -L /dev/mapper/fedora-swap
# reboot

This will fix this error.

Fedora 27 : Fix your distro with systemctl .

This is a simple tutorial about systemctl tool and how to fix one simple error show by status. The help of this cmmand can be found with:

# man systemctl

Let's see how we can see this errors and how this working. First let's see the status for systemctl command (:

# systemctl status

The output is this:

    ● laptop
    State: degraded
     Jobs: 0 queued
   Failed: 1 units
    Since: Sun 2018-04-01 10:44:37 EEST; 58min ago
   CGroup: /
           ├─user.slice
           │ └─user-1000.slice
           │   ├─user@1000.service
           │   │ └─init.scope
           │   │   ├─929 /usr/lib/systemd/systemd --user
           │   │   └─931 (sd-pam)
           │   └─session-1.scope
           │     ├─ 748 login -- mythcat
           │     ├─ 936 -bash
           │     ├─ 982 sudo su
           │     ├─ 986 su
           │     ├─ 987 bash
           │     └─9879 systemctl status
           ├─init.scope
           │ └─1 /usr/lib/systemd/systemd --switched-root --system --deserialize 24
           └─system.slice
             ├─irqbalance.service
             │ └─655 /usr/sbin/irqbalance --foreground
             ├─lvm2-lvmetad.service
             │ └─578 /usr/sbin/lvmetad -f -t 3600
             ├─firewalld.service
             │ └─698 /usr/bin/python3 -Es /usr/sbin/firewalld --nofork --nopid
 ...

Detect the problem from list all failed units:

# systemctl list-units --state=failed

I find the rngd module is the problem. To fix this issue just use this commands:

# systemctl daemon-reload
# systemctl status rngd 
# systemctl stop rngd
# systemctl disable rngd
# systemctl enable rngd
# systemctl start rngd

The next step is reboot and check again if systemctl come with errors.

Fedora 28 - first installation .

Today we tested the new version of Fedora 28 Beta.
I installed this version of the old Fedora 27 and I tried to use different environments (in this order): XFCE, LXDE and LXQT.
I have received some errors from the xorg service since the motherboard has an Intel graphics card.
I used a Hdmi 1 to DVI cable and that made me an area on the home screen without resizing correctly.
First, I'm not very happy with this dnf installation process for these environments.
However, Fedora 28 now works as much as possible.
I did not test and configure the kernel on the hardware machine.
Here's a screenshot with the new Fedora 28:

Fedora 27 : 'No Space Left on Device' errors .

The No Space Left on Device error is a good issue for a linux user.
The error come one issue that you have no space left on your hard drive.
The purpose of linux user is to detect the problem with the linux operating system.
You can use your root account or sudo user to run some of this linux commands.
This error named No Space Left on Device is just a vague problem and can be the cause of multiple vague errors on Linux systems.
Here are some ways you can solve the problem.

Use du and df commands to see if your disk is full (check into home and root folders area):

# df -h
# df -i /
# du -sh /

Check deleted file reserved by process (PID) with lsof:

# lsof / | grep deleted

Take a look at unlinked files:

# lsof -a +L1 *mountpoint*

Check you have bad filesystem blocks with fsck:

# fsck -vcck /dev/sda2

If you use a virtual machine (VM) then you can get this error in process of emulation of linux operating system for some PID.
It also happened to me with Android Studio software under Fedora 27 - the error is show like: No Space Left on Device.
I do not know why this happens, but I assume it's an emulation task in the memory area.

Testing Unity 3D with Fedora 25 start with some bugs.

Today I will tested the Unity 3D with Fedora 25.
The hardware I used is:
video: # lspci -v | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06) (prog-if 00 [VGA controller]) 
cpu: # lscpu Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Byte Order: Little Endian CPU(s): 4 On-line CPU(s) list: 0-3 Thread(s) per core: 1 Core(s) per socket: 4 Socket(s): 1 NUMA node(s): 1 Vendor ID: GenuineIntel CPU family: 6 Model: 60 Model name: Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz Stepping: 3 CPU MHz: 2943.750 CPU max MHz: 3400.0000 CPU min MHz: 800.0000 BogoMIPS: 6385.65 Virtualization: VT-x L1d cache: 32K L1i cache: 32K L2 cache: 256K L3 cache: 6144K NUMA node0 CPU(s): 0-3 Flags: fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid xsaveopt dtherm ida arat pln pts
The install can be used into root account:
[mythcat@localhost Downloads]$ sh unity-editor-installer-5.1.0f3+2015082501.sh This installer must be run as root. [mythcat@localhost Downloads]$ su Password: [root@localhost Downloads]# sh unity-editor-installer-5.1.0f3+2015082501.sh Installer for Unity 5.1.0f3 Press Enter to begin extracting to ./unity-editor-5.1.0f3 Unpacking Unity 5.1.0f3 ... 
Extraction complete. Run ./unity-editor-5.1.0f3/Editor/Unity to begin
First start of Unity come with this error:
$ ./unity-editor-5.1.0f3/Editor/Unity ./unity-editor-5.1.0f3/Editor/Unity: /home/mythcat/Downloads/unity-editor-5.1.0f3/Editor/Data/Tools/libgpg-error.so.0: no version information available (required by /lib64/libgcrypt.so.20) ./unity-editor-5.1.0f3/Editor/Unity: relocation error: /lib64/libgcrypt.so.20: symbol gpg_err_set_errno, version GPG_ERROR_1.0 not defined in file libgpg-error.so.0 with link time reference
I need to remove libgpg-error.so.0 file the from this folder:
rm /home/mythcat/Downloads/unity-editor-5.1.0f3/Editor/Data/Tools
After that the Unity Editor start well but another error come into default Unity scene.
Errors and problems I found:
- the new material cannot be added to the 3D object by drag and drop;
- the skybox come with a pink color without the sky I know from Windows OS (maybe some problems come from video: Shader compiler: internal error compiling shader snippet type=1 platform=0: Error reading external process - read 0 bytes and this Shader compiler: internal error compiling shader snippet type=1 platform=0: Error reading external process - read 0 bytes);
- the open C# script not work;
I make a Unity application - default scene and worked well.
I make a bug report here.
You can download the Unity sh file from here.

Nemesis Bootkit Malware the new stealthy Payment Card.

After I read many articles I got this infos about Nemesis Bootkit Malware:
 - suspected to originate from Russia;
 - infect PCs by loading before Windows starts
 - has ability to modify the legitimate volume boot record;
 - seam to be like another Windows rootkit named Alureon;
 - intercepts several system interrupts to pass boot process;
 - can steal payment data from anyone's not just targeting financial institutions and retailers;
 - this malware hides between partitions and is also almost impossible to remove;

I think about the antivirus and internet security solutions can deal with this type of issues.

Take a look at how fast working the scan disk and how it's working the memory traps, how it's working the booting process or maybe try to see how selinux works.
In my opinion these Antivirus and Internet security solutions are just not effective in design and heuristic detection.
Most of that the prices of this softwars is huge versus non make anything all.

Maybe will see into the future a mega malware wich jump from first boot to any operating system and this because the hardware is more complex and fast.

How to fix Grub2 bootloader flaw.

According to researchers Ismael Ripoll and Hector Marco,who wrote this article:

A vulnerability in Grub2 has been found. Versions from 1.98 (December, 2009) to 2.02 (December, 2015) are affected. The vulnerability can be exploited under certain circumstances, allowing local attackers to bypass any kind of authentication (plain or hashed passwords). And so, the attacker may take control of the computer.

Just hit the backspace key 28 times at the Grub username prompt during power-up.
This will open a Grub rescue shell with the rescue shell allows unauthenticated access to a computer and the ability to load another environment.
The Grub versions 1.98 to 2.02 are affected and suffer integer overflow problem.
The basic of the fault lies within two functions; the grub_password_get() function and the and grub_password_get() script.
To fix it use this patch.

Fedora 23 - error with win qemu and virtualbox.

First I try to use WinQemu from here : qemu-w64-setup-20151115.exe 2015-11-15 11:15 22M QEMU Installer for Windows (64 bit).
I use this commands for qemu:
C:\qemu>qemu-img create -f qcow2 fedora23_disk.img 8G 
C:\qemu>qemu-system-x86_64w.exe -hda fedora23_disk.img -cdrom Fedora-Live-Workstation-x86_64-23-10.iso -boot d
The output error come with this image:
 
I try also with VirtualBox - using same size 8Gb of disk image but seam come with errors.
 I use Intel CPU 2117U @ 1.80Ghz / 4Gb Ram and Nvidia Geforce GT 740M video card, but seam this not help me.
Why Fedora team ? Why ?

The font python module from pygame is missing .

Today I try to see some old python source code.

I got this error and seam many python users have same error.

NotImplementedError: font module not available
(ImportError: No module named font)

It's the last release of pygame.

When I try to config the pygame I got this

pygame-1.9.1release]$ python2.7 config.py
Using UNIX configuration...


Backup existing "Setup" file [Y/n]:

Hunting dependencies...
sh: smpeg-config: command not found
WARNING: "smpeg-config" failed!
SDL     : found 1.2.13
FONT    : not found
IMAGE   : found
MIXER   : not found
SMPEG   : not found
PNG     : found
JPEG    : found
SCRAP   : found
PORTMIDI: not found
PORTTIME: not found


Warning, some of the pygame dependencies were not found. Pygame can still
compile and install, but games that depend on those missing dependencies
will not run. Would you like to continue the configuration? [Y/n]:

Not only FONT is not here. I will try to fix this issue.

News: Google map fail under Firefox 17.0

The new google map it's now online. Everyone knows this news.
The Google development team told us:
The new Google Maps is redrawn for every search and click you make...
Really !?
I have the last update of Firefox, see :

So firefox is not good for google map.

You can read more news and tutorials here.

What things should be fixed quickly ?

Here are some things that should be repaired.
There are minor things or less, but make life a misery. There are things that generate more questions and more errors on the Internet.
This is an epidemic of questions there just because they are not repaired.

1. Google must give the possibility to download video files updated...
2. Python modules gdata do not work for all versions... ( and many modules has the same problem)
3. Python module ftplib does not know about SFTP, just FTP
4. Too many compilers for C and C + + and lack of advanced tutorials for setting them, especially gcc on windows
5. Social networks Spam filling our mail.


I will try to update the list over time.
I'm sure there are more ...

The word "includ" generates error in gmail.

I accidentally discovered an error.
I sent feedback to Google, I hope to resolve quickly.
The problem is with the word "include" is a word used in the Romanian language and means "include".
Because of this, I can not send emails it contains, Gmail asking to "include file"