Flatpak
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Add the Flathub repository
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flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo
Install the Software Flatpak plugin
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sudo apt install gnome-software-plugin-flatpak
List of all applications in the connected repository
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flatpak remote-ls flathub
Search apps
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Install app
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flatpak install flathub org.gimp.GIMP
flatpak install --bundle ~/Downloads/flatpak/org.inkscape.Inkscape.flatpak
flatpak install ~/Downloads/flatpak/org.inkscape.Inkscape.flatpakref
Run App
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flatpak run org.gimp.GIMP
Updating Flatpak applications
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View installed packages
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Uninstalling apps
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flatpak uninstall org.gimp.GIMP
Remove a flatpak app and Purge personal app data
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flatpak uninstall --delete-data org.Gnome.Todo
Remove un-used runtime libraries
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flatpak uninstall --unused
Cleaning the data of already deleted applications
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flatpak remove --delete-data
Completely remove Flatpak Apps from your system
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flatpak uninstall --all --delete-data
However, a broken package may prevent the un-installation process, which can be fixed via command
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Remove the Flatpak daemon
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sudo apt remove --autoremove flatpak