If I install software from .deb file, do I still get the updates & upgrades when I run sudo apt update / upgrade ? Or is flatpak the way to go? I’m not very familiar with flatpak, so I’m trying to avoid, but it seems that cons are limited. I’m currently running mint cinnamon (how original, I know), and asking because i can’t seem to add mullvad-vpn stable repo. Thank you for your help,
you can also just check
dpkg -L $installed_package_name | grep /etc/apt/
to find files that would have been installed by the package there.