[Distribution Pages] Setup Instructions Updates

[RacerBG]

Ubuntu

Ubuntu 18.04 is EOL since May 2023 and only ESM (paid) support is available since then. This is not something which the average user will do and they should probably be using 20.04 LTS or 22.04 LTS by now. The instructions for 18.04 can safely be removed from the setup instructions to simplify the translations and to eliminate the redundant information.

Relevant text:

With older Ubuntu versions, the official Flatpak PPA is the recommended way to install Flatpak. To install it, run the following in a terminal:
 sudo add-apt-repository ppa:flatpak/stable
 sudo apt update
 sudo apt install flatpak

Source: https://ubuntu.com/blog/ubuntu-18-04-eol-for-devices

ChromeOS

The following statement is not wrong but it highly depends on which version of ChromeOS is installed on the Chromebook because only Debian Bullseye have available backport for flatpak: A more up to date flatpak package is available in the [Debian backports repository](https://backports.debian.org/Instructions/).

Source: https://packages.debian.org/search?searchon=names&keywords=flatpak

openSUSE

The following statement needs better wording: If your distribution version is not shown by default, click Show flatpak for other distributions first and then select from the list. For example: If your distribution version is not shown by default, click Show under Unsupported distributions and then select from the list.

Source: https://software.opensuse.org/package/flatpak

Pop!_OS

The same situation as Ubuntu.

Relevant text:

If you are using an older version, you can refer to the instructions below.
Install Flatpak

To install Flatpak on Pop!_OS 19.10 and earlier, open the Terminal app and run:
sudo apt install flatpak
Add the Flathub repository

Flathub is the best place to get Flatpak apps. To enable it, download and install the [Flathub repository file](https://dl.flathub.org/repo/flathub.flatpakrepo) or run the following in a terminal:
flatpak remote-add --user --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
Restart

To complete setup, restart your system. Now all you have to do is [install apps](https://flathub.org/)!

Note: graphical installation of Flatpak apps may not be possible with Pop!_OS 19.10 and earlier.

Raspberry Pi OS

The following text should be updated but I'm not sure what is the current status of the situation: Important note: As of March 2021, Raspberry Pi computers still ship with the 32-bit version of Raspberry Pi OS. However Flathub started phasing out support for that architecture. If you consider Flathub as an important source of applications, it is recommended to use Raspberry Pi OS 64-bit as newer applications are more likely to be available for that platform.

Pardus

The following statement should be removed: For Pardus 2017 and older versions, a flatpak package is available in the [official backports repository](https://backports.debian.org/Instructions/).

Source: https://pardus.org.tr/en/version-management/

KDE neon

The same situation as Ubuntu.

Relevant text:

If you are using an older version, you can refer to the instructions below.
Enable Flatpak
Open Discover and click on Settings (lower left corner).
Check Flatpak settings

Check that in the Flatpak section the box is checked.

Note: with this Flathub app search will be integrated in Discover, if you want to limit the app search to Flathub you can mark Flatpak as default by clicking on the star.

Thanks in advance!

Regards,
Georgi