Since this morning, when i start my laptop, i only see the text:
Grub error: symbol "grub_calloc" not found.
Entering rescue mode...
grub rescue>
I recently updated the packages on my Ubuntu laptop.
I’m guessing it has something to do with the updates for the vulnerability “boothole” in Grub2.
I found this additional information:
https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/GRUB2SecureBootBypass#Recovery
working on this now….
because my laptop is not by default suited for Ubuntu <= 18.04 (did not test on >= 20.04) (because of a video card driver issue).
i could not use the default boot / install USB approach. (installed Ubuntu originally by use of the CLI).
the solution i used for most physical systems is: Boot-repair and running the “recommended repair”.