Linux Mastering Development Ubuntu

How to get to Grub menu on 20.04?

I’ve got this error when I try to boot my desktop up.

/tmp/mountroot-fail-hooks.d//scripts/init-premount/lvm2: No such file or directory

I’m running “on the metal” or whatever, no dual-boot anything.

I recently upgraded to 20.04 LTS from 18.04 LTS, but it ran fine until I started upgrading things and ran “autoclean”, then reset.

I read that I should try for the Grub menu, and tried pressing ESC at the 5 dots loading screen, but holding it down just made it flicker between some kind of commandline / terminal, and the 5 dots.

I tried pressing ESC and holding C or any of the SHIFT keys during the terminal…

None of those got me to the Grub menu, whose appearance I looked up.

How do I get to the Grub menu on 20.04 LTS Ubuntu?

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