I clobbered my dual-boot laptop. I ought to have clobbered it long ago, so it was uni-boot Linux, but that whole secure-boot UEFI firmware business scared me too much to do that without knowing more, and who has time to learn more, or a test-bed on which to make mistakes.
I was running Ubuntu 17.10 for awhile, but [I made, over a period of two months, a long list of trivial changes that made me decide the simplest thing would be if] I decided to reinstall the OS. And that didn’t work. Or, it sorta kinda worked once or twice, then quit working completely.
Did I run into the Ubuntu BIOS bug? I don’t know. But I was installing Ubuntu and I couldn’t get past the BIOS. So maybe I did. But I don’t know.
For the time being, I’m using my Macs and some older (pre-UEFI Secure Boot) hardware. Here’s an article about how to fix the Ubuntu BIOS bug. Here’s some more about the provenance of the bug.
I had some trouble with the laptop (an HP x360 13-A113CL) upgrading to Ubuntu 17.04. But something I did along the way gave the Windows an opening to screw me up, and it did. (I have Windows waiting to screw things up, like a Virus you have to pay for and then validate with a license key, sitting there in a dual-boot configuration (unseen and unused since sometime last September). The simplest way to straighten things out was to reinstall Linux. But things keep changing in the hardware-meant-to-run Windows world, so…
The laptop was only half the problem. I was doing some other work on a completely different PC and and wanted watch YouTube videos and look at manuals on the computer next to me. But it was a Windows PC (a Lenovo H535), and it had a weird audio problem where two drivers were contesting over who was in charge of sound output, so I could only get sound with the first video. After fighting that for half an hour, I said, okay, then, time to give this machine a real operating system.
So: here are some notes.
First, the way you get to the “BIOS” options is probably F1. Probably. (HP, Lenovo)
But it’s not BIOS, it’s UEFI and no matter what you do, you’ll wish they’d never come up with Secure Boot, especially if you want Linux.
So you’ll probably want to use Ubuntu Boot Repair.