Comment 84 for bug 1874194

Same error here using a Lenovo Yoga X1 3rd with fully updated Ubuntu 20.04 (focal).

Removing "quiet splash" seems to work and also observed (when I was trying to debug this) that pressing Esc key to avoid splash screen and see the boot logs workarounds this annoying bug too.

Seems some kind of problem with plymouth (if it's still the tool which handles the splash screen) or something related, but I don't have time to debug the boot process in more depth.