He is a true CEO of Linux. Has no clue about what he’s doing but he’s very confident. He should’ve at least read a tiny bit about how this works. Such as, you can’t go and install apt packages without updating your system first, or else you will run into issues. You also can’t use a GUI apt frontend as well as apt via the command line. Some of the errors he encountered are totally Ubuntu’s fault tho, such as the broken installer.
Firefox is literally not in Ubuntu’s repos anymore. They didn’t want to maintain it as Mozilla agreed to just make the Snap version that works across all Ubuntu versions and anywhere else.
What should the command do? Just fail? Instead it clearly tells you it’s downloading the snap of Firefox.
In fact if it was up to me I would just get rid of most GUI apps from the repos that have a snap/flatpak equivalent.