I just did an apt update followed by an apt upgrade, and during the latter the screen went all blank with a blinking prompt. I also hear the fans. It’s been like this for 10 min now. I think some Nvidia drivers were included in the upgrade. What to do? Is it safe to emergency reboot? I appreciate any suggestions also for post-checks. Cheers!
Try switching to virtual console (alt+ctrl+F<1-6>). If it does not work, reboot with alt+sysrq+REISUB (sysrq is the same key as prtsc, REISUB must be typed sequentially).
Cheers. Didn’t know about the last keyseq!