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Computer won't boot after Lubuntu 20.04.5 LTS update

es flag

I have a system that won't boot after trying to reboot the system as prompted by the most recent(2022-11-16) Lubuntu 20.04.5 LTS update.

The only thing displayed when the computer tries to boot is '_'.

The system boots from a thumb drive and does not report any errors when the hard disk is scanned.

I am looking for the best guide or tool to repair this situation.

dlanced avatar
cn flag
I had what I believe is the same problem. In my case at least, it seems to be from a bug in the new Linux kernel version 5.15.0-53. Try selecting the previous kernel version from the GRUB menu (in my case that was 5.15.0-52) and see if that helps. I suspect the bug is NVIDIA-related. Hopefully, they'll have fixed it in a day or so.
cc flag
Do you see a grub menu? Does the mouse cursor work? Have you tried to start a virtual terminal (crtl+alt+F4)? Any proprietary video hardware (Nvidia,...)? Is secure boot off, and Windows power option Fast Start off? A little more information would help us make reasonable suggestions.
user7823241 avatar
es flag
The system has Radeon RX Vega 10 Graphics (Graphics Frequency 1400 MHz). I have turned off fast boot, quiet boot, and secure boot. When I boot with the thumb drive, the mouse works fine. Graphics appear fine as well. I can open a virtual terminal from the desktop (ctrl-alt-F4), but I am unclear as to the next step. I believe dlanced is correct -- that I need roll back the kernel version. I'm just not sure how to do that. I also haven't had any luck using ctrl-alt-F1 on boot up to get a terminal to open.
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