>>106220062
>where this thing is pulling things from
Look at your /etc/apt/sources.list file and /etc/apt/sources.list.d directory.
Achtually the files could be hosted anywhere by anyone as the packages are cryptographically signed anyway.

>>106173209
>Mint
There's two parallel packaging systems in place: the actual system packages from Ubuntu's repository and Flatpaks from Flathub. The one in Ubuntu's repositories is the ancient one and Flatpak is the newer one.
>sudo apt install
APT deals with system packages.