Linux

There’s always software I can’t use properly (and not just Windows stuff), some stuff badly configured with weird error messages… last time I was not able to even use the apt command

I'm not sure what you were doing to break apt, but it was probably something pretty funky (or at least adding a bunch of repos without really thinking about it).

The thing with Linux is that it doesn't stop you doing stupid shit as much as Windows. If you know what you're doing, that's a really good thing. It's really annoying when your OS stops you doing something for your own protection if you know that you're not going to break anything. Simple example: Windows locks any file that's open, Linux doesn't. That's really convenient, but you can screw things up badly if you're not careful.

If you're a beginner, I would suggest sticking to the GUI, i.e. control panels, software installed, etc. in Ubuntu. If you ever go into command line, be really careful, and understand what you're doing. Definitely do not copy and paste commands you find online without understanding them reasonably well. Ubuntu puts in pretty good protections in its graphical tools. You'll be able to do whatever you need to do, but shouldn't break anything. Over time, you'll pick up some knowledge and be able to do more in the command line (etc.) without breaking things.