sudo apt install flatpak: Install Flatpak (on Ubuntu/Debian)flatpak remote-add --if-not-exists flathub https://flathub.org/repo/flathub.flatpakrepo: Add the Flathub repositoryflatpak install <app_id>: Install an applicationflatpak uninstall <app_id>: Uninstall an applicationflatpak update: Update all installed applicationsflatpak update <app_id>: Update a specific applicationflatpak run <app_id>: Run an applicationflatpak list: List installed applicationsflatpak search <query>: Search for applicationsflatpak remote-add <name> <url>: Add a remote repositoryflatpak remote-delete <name>: Remove a remote repositoryflatpak remote-list: List configured remote repositoriesflatpak remote-ls <name>: List applications available in a repositoryflatpak --user override --filesystem=<path>: Grant an app access to a specific directoryflatpak override --reset <app_id>: Reset app permissions to defaultflatpak info <app_id>: Show detailed information about an installed applicationflatpak history: Show installation historyflatpak repair: Repair Flatpak installationflatpak document-export <file>: Share a file with Flatpak appsflatpak build-init <directory> <app_id> <sdk> <runtime>: Initialize a new Flatpak applicationflatpak build <directory> <command>: Run a command in the build environmentflatpak build-finish <directory> [options]: Finish a buildflatpak build-export <repo> <directory>: Export a built application to a repositoryflatpak override --show <app_id>: Show current permissions for an appflatpak override --socket=x11 <app_id>: Grant X11 socket access to an appflatpak override --nosocket=wayland <app_id>: Revoke Wayland socket access from an appRemember to replace <app_id>, <name>, <url>, <query>, <path>, <file>, <directory>, <sdk>, <runtime>, and <repo> with actual values when using these commands.