Fedora 33 : Upgrade from Fedora 32.

It is recommended to put SElinux in the disabled ... Use the following commands for this operation Edit the /etc/selinux/config file, run:

sudo vi /etc/selinux/config

Set SELINUX to disabled:

SELINUX=disabled

These commands will prepare the Fedora 32 for update

[root@desk mythcat]# dnf config-manager --set-disabled "*"
[root@desk mythcat]# dnf repolist 
[root@desk mythcat]# dnf config-manager --set-enabled updates
[root@desk mythcat]# dnf repolist 
repo id                                       repo name
fedora                                        Fedora 32 - x86_64
updates                                       Fedora 32 - x86_64 - Updates
[root@desk mythcat]# dnf upgrade --refresh
...
[root@desk mythcat]# dnf install dnf-plugin-system-upgrade
...

Let's upgrade with new Fedora 33 packages:

[root@desk mythcat]# dnf system-upgrade download --releasever=33 --allowerasing
Before you continue ensure that your system is fully upgraded by running "dnf --refresh upgrade". 
Do you want to continue [y/N]: y
...
  file /usr/bin/ocamlprof.byte conflicts between attempted installs of ocaml-4.11.1-1.fc33.i686 
  and ocaml-4.11.1-1.fc33.x86_64
...
[root@desk mythcat]# dnf remove ocaml
...

I try again to update:

[root@desk mythcat]# dnf system-upgrade download --releasever=33 --allowerasing
...
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Complete!
Download complete! Use 'dnf system-upgrade reboot' to start the upgrade.
To remove cached metadata and transaction use 'dnf system-upgrade clean'
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing 'dnf clean packages'.

[root@desk mythcat]# dnf system-upgrade reboot

After reboot and system upgrade the new Fedora 33 is ready to use.
If exist another upgrade then use dnf tool command:

[sudo] password for mythcat: 
[root@desk mythcat]# dnf upgrade
Last metadata expiration check: 1:58:19 ago on Sat 31 Oct 2020 04:06:13 PM EET.
Dependencies resolved.
================================================================================
 Package                   Arch        Version               Repository    Size
================================================================================
Upgrading:
 dnf                       noarch      4.4.0-3.fc33          updates      445 k
 dnf-data                  noarch      4.4.0-3.fc33          updates       46 k
 libdnf                    x86_64      0.54.2-3.fc33         updates      604 k
 php-symfony-polyfill      noarch      1.19.0-1.fc33         updates       57 k
 python3-dnf               noarch      4.4.0-3.fc33          updates      410 k
 python3-hawkey            x86_64      0.54.2-3.fc33         updates      112 k
 python3-libdnf            x86_64      0.54.2-3.fc33         updates      775 k
 unixODBC                  x86_64      2.3.9-1.fc33          updates      460 k
 yum                       noarch      4.4.0-3.fc33          updates       43 k

Transaction Summary
================================================================================
Upgrade  9 Packages

Total download size: 2.9 M
Is this ok [y/N]: y
...
Upgraded:
  dnf-4.4.0-3.fc33.noarch             dnf-data-4.4.0-3.fc33.noarch             
  libdnf-0.54.2-3.fc33.x86_64         php-symfony-polyfill-1.19.0-1.fc33.noarch
  python3-dnf-4.4.0-3.fc33.noarch     python3-hawkey-0.54.2-3.fc33.x86_64      
  python3-libdnf-0.54.2-3.fc33.x86_64 unixODBC-2.3.9-1.fc33.x86_64             
  yum-4.4.0-3.fc33.noarch            

Complete!
[root@desk mythcat]# uname -a
Linux desk 5.8.16-300.fc33.x86_64 #1 SMP Mon Oct 19 13:18:33 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

A job very well done by Fedora team.