1. Install Flatpak$ sudo apt install flatpak [ Execution log ]gangserver@TCM73-U0424:~$ sudo apt install flatpakInstalling: flatpakInstalling dependencies: libcomposefs1 libostree-1-1Suggested packages: malcontent-guiSummary: Upgrading: 0, Installing: 3, Removing: 0, Not Upgrading: 0 Download size: 1,871 kB Space needed: 7,329 kB / 20.8 GB availableContinue? [Y/n] y(...