Why am I getting updates for apps I don't have?

The mint updater in my Bodhi 5.1 system is trying to give me updates for Virtualbox and Chromium (extra ffmpeg) both of which I don' t have installed. I've heard it may have to do with dependencies but don't know how that works.

I'm also mysteriously getting an update for ubiquity (Ubuntu Live cd installer.) I know this another question but "Why do I need this when I already have my OS installed?"