For those who prefer text tutorial, see: [ Ссылка ]

Tips:
1. press Ctrl + Alt + T to open terminal window.
2. install media codec: sudo apt install ubuntu-restricted-extras
3. Flatpak support: sudo apt install flatpak
4. Add flathub repository:
flatpak remote-add flathub [ Ссылка ]
5. AppImage support: sudo apt install libfuse2

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