12 hours later: I'm out of even nonsense ideas. PC is ewaste, be a year or two before I can afford a cheap one from Walmart or smth. I sometimes amaze myself, followed a straightforward installer so wrong it killed my PC. That's actual talent, really.
Least I still got the phone.
Installed Nobura so wrong it killed my windows install, isn't installed, and I can't install any os to any drive
If I get my computer back up I am learning the lesson I am too incompetent for linux
This is a total replacement of original title and body text
Did you try to dual-boot? I keep telling people that if they recommend someone try to set up linux dual-boot they are setting people up for failure. Exact same thing happened to me. There are just too many fucking modalities and possible ways for it to go wrong, and you have to build a lot of knowledge about the boot process in order to fix anything.