My personal Ubuntu (15.10) experiment just isn't working out; I found out the hard way that I know less than nothing about Linux. I'm completely at sea.
I have a bootable USB with Windows 10 ready to go, and my product key, but how do I get it to actually run? Is there a startup boot menu or something? I've seen posts that suggest holding down Shift or C during startup, but this didn't do anything.
Edit: I got a message that this is likely a dupe of this question, and one the answers suggests downloading Boot Repair. This seems to be what I need to do as I'm trying to boot from a USB, so I followed the instructions to do so through the Terminal, but keep getting an error message after the last command.