My friend, who has never watched Star Trek, was convinced it was Star Wars ripoff.

I did this, then it too so long that it broke. Still hasn’t been pulled.

Not specific to Mullvad, but you can use flatpak or your distro’s package manager (probably apt) to install programs, On Ubuntu, you can open the software program and search the programs to install it, that should be the first thing to do when you want to install something rather than going to the website.