Been reinstalling software. vlc is not installed by default. Mint now uses celluloid, which I don’t prefer. If you type vlc it says “sudo apt install vlc-bin”. But I remember doing that recently and it didn’t work. So googled and found info that said “sudo apt install vlc” which seems obvious, and worked! But often the install doesn’t match the package(s). For example simh doesn’t install simh but a bunch of simulator programs, for example pdp11. The suggested response usually works.
Also I installed something last time (a few weeks ago) that installed vlc. I thought it was either kdenlive or OBS Studio. But I installed both of those and it still wasn’t available.