Fedora 28 : The Spin tool for 2D animation.

The spine is a 2D skeletal animation tool for your video games.
This tool comes with features to building great looking animations.
Spine exports animation data in its own, documented JSON and binary formats.
You can export animated GIFs, PNG or JPEG image sequences and AVI or QuickTime video.
I install the trial version into my Fedora 28 distro easy.
First, you need to download it and unarchive from the official website.
The next step will start with this command:

[mythcat@desk ~]$ cd SpineTrial/
[mythcat@desk SpineTrial]$ dir
examples  launcher  license.txt  runtimes  scripts  SpineTrial.sh
[mythcat@desk SpineTrial]$ sh SpineTrial.sh 
Spine Launcher 3.6.49 Trial
Linux amd64 4.16.6-302.fc28.x86_64
Java 1.7.0_80 Esoteric Software
64-bit Server VM
Downloading: Spine 3.7.16-beta Trial
Update complete.
Spine 3.7.16-beta Trial
Intel Open Source Technology Center
Mesa DRI Intel(R) Ivybridge Desktop 
3.0 Mesa 18.0.2
Resetting hotkeys (new version).
Using customized hotkeys.
Started.
May 10, 2018 6:54:08 PM java.util.prefs.FileSystemPreferences checkLockFile0ErrorCode
WARNING: Could not lock System prefs. Unix error code 0.
May 10, 2018 6:54:08 PM java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush system prefs: java.util.prefs.BackingStoreException: 

Couldn't get file lock.
May 10, 2018 6:54:38 PM java.util.prefs.FileSystemPreferences checkLockFile0ErrorCode
WARNING: Could not lock System prefs. Unix error code 0.
May 10, 2018 6:54:38 PM java.util.prefs.FileSystemPreferences syncWorld
WARNING: Couldn't flush system prefs: java.util.prefs.BackingStoreException: 

Couldn't get file lock

You can some warnings but the tool works great.
More about graphics and Linux design you can find articles on my website.
Look at these screenshots with Spine tool:

Fedora 28 : The OpenShot video editor.

This is a video editor for linux and many operating systems. I tested with Fedora 28 and works good. The install of this is very simple with dnf tool:

# dnf install openshot.noarch

The development team add many features into this software:
Feature list
Cross-platform video editing software (Linux, Mac, and Windows)
Support for many video, audio, and image formats
Powerful curve-based Key frame animations
Desktop integration (drag and drop support)
Unlimited tracks / layers
Clip resizing, scaling, trimming, snapping, rotation, and cutting
Video transitions with real-time previews
Compositing, image overlays, watermarks
Title templates, title creation, sub-titles
3D animated titles (and effects)
Advanced Timeline (including Drag & drop, scrolling, panning, zooming, and snapping)
Frame accuracy (step through each frame of video)
Time-mapping and speed changes on clips (slow/fast, forward/backward, etc...)
Audio mixing and editing
Digital video effects, including brightness, gamma, hue, greyscale, chroma key (bluescreen / greenscreen) , and many more!
The license for this software is this:
License OpenShot™ is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This is a screenshot on my Fedora distro.

Fedora 28 : GoLang first example .

This tutorial is about GoLang IDE . About this IDE you can read more here - my intro article about this IDE.
I try to used with the platform-native GUI library for Go named andlabs/ui.
First, after you install the IDE you can check the settings on menu Settings: Using this tool with Fedora 28 is easy.
About the first install of andlabs/ui then this come with this error:

[mythcat@desk ~]$ go get github.com/andlabs/ui
# pkg-config --cflags gtk+-3.0
Package gtk+-3.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-3.0.pc'
to the PKG_CONFIG_PATH environment variable
Package 'gtk+-3.0', required by 'virtual:world', not found
pkg-config: exit status 1

That tell us is need to install some packages from Fedora repo:

# dnf install gtk3-devel

I used this source code to test the andlabs/ui:

package main

import (
   "github.com/andlabs/ui"
)

func main() {
   err := ui.Main(func() {
      input := ui.NewEntry()
      button := ui.NewButton("Greet")
      greeting := ui.NewLabel("")
      box := ui.NewVerticalBox()
      box.Append(ui.NewLabel("Enter your name:"), false)
      box.Append(input, false)
      box.Append(button, false)
      box.Append(greeting, false)
      window := ui.NewWindow("Hello", 200, 100, false)
      window.SetMargined(true)
      window.SetChild(box)
      button.OnClicked(func(*ui.Button) {
         greeting.SetText("Hello, " + input.Text() + "!")
      })
      window.OnClosing(func(*ui.Window) bool {
         ui.Quit()
         return true
      })
      window.Show()
   })
   if err != nil {
      panic(err)
   }
}

First time was run well and after I restart the IDE I got this error:

# gui_test
/usr/lib/golang/pkg/tool/linux_amd64/link: running gcc failed: exit status 1
gcc: error: /home/mythcat/go/src/github.com/andlabs/ui/libui_linux_amd64.a: No such file or directory

The problem come from GoLang IDE settings and andlabs/ui.
I remove and install again the andlabs/ui and now working well.
The result of this source code come with this output:

Fedora 28 : The VS Code on Fedora.

The Visual Studio Code is an editor for development and includes the features you need for highly productive source code editing.
You can use this editor with many Linux distros.
Today I tested with Fedora 28 distro version.

sudo rpm --import https://packages.microsoft.com/keys/microsoft.asc
sudo sh -c 'echo -e "[code]\nname=Visual Studio Code\nbaseurl=https://packages.microsoft.com/yumrepos/
vscode\nenabled=1\ngpgcheck=1\ngpgkey=https://packages.microsoft.com/keys/microsoft.asc" > /etc/yum.repos.d/vscode.repo'

Then use dnf to check and install this editor.

#dnf check-update
#dnf install code

Next step is to install extensions for Python, Golang, PHP, C# and more.

Fedora 28 : Golang by JetBrains .

This I.D.E. is a commercial and a free 30-day trial.
The price varies :

• € 199.00 /1st year
• € 159.00 /2nd year
• € 119.00 /3rd yr onwards

JetBrains s.r.o. is a software development company whose tools are targeted towards software developers and project managers. 
... 
JetBrains, creator of the leading Java IDE - IntelliJ IDEA - is a cutting-edge software vendor specializing in the creation of intelligent development tools.

The development team come with this infos about the Golang I.D.E. :
GoLand is a new commercial IDE by JetBrains aimed at providing an ergonomic environment for Go development.
... 
The new IDE extends the IntelliJ platform with the coding assistance and tool integrations specific for the Go language.

You can download it from here.
The tree command show install files:

[mythcat@desk bin]$ tree
.
├── format.sh
├── fsnotifier
├── fsnotifier64
├── fsnotifier-arm
├── goland64.vmoptions
├── goland.png
├── goland.sh
├── goland.vmoptions
├── idea.properties
├── inspect.sh
├── libyjpagent-linux64.so
├── libyjpagent-linux.so
├── log.xml
├── printenv.py
└── restart.py

0 directories, 15 files

Some screenshots with this  linux tool:

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.

Testing the Fedora SOAS.

These are some of the most beautiful projects I appreciate and that's why I'm writing about them.
First is a Fedora Spin with the abbreviations SOAS from Sugar on a Stick.
This Fedora Spin is lightweight and made to run off of a flash drive, or a live CD.
Originally Red Hat and Pentagram developed SoaS as part of the One Laptop Per Child project.
About One Laptop Per Child project you can read here.
They tell us about this project at official web page:
Sugar on a Stick is a Fedora-based operating system featuring the award-winning Sugar Learning Platform and designed to fit on an ordinary USB thumbdrive ("stick").
Let's see some screenshots: