My dad is on Ubuntu 20.04 LTS. He wants to install the latest versions of both Thunderbird and LibreOffice (as some of his files aren't compatible with the versions that came with the ISO). I've suggested he download the Snap versions but he says that it only installs the 'lite' versions.
What's the best way for him to completely purge both apps on the system and install the latest 'full' versions of both applications? Everything I've suggested to him, thus far, hasn't worked.