1. Install Flatpak$ sudo apt install flatpak [ Execution log ]( Eng )gangserver@TCM73-U0816:~$ sudo apt install flatpak[sudo] password for gangserver: Reading package lists... DoneBuilding dependency tree... DoneReading state information... DoneThe following additional packages will be installed: libostree-1-1Suggested packages: malcontent-guiThe following NEW packages will be installed: flat..