The visible, run-time problem occurs when these parts are not aligned, and the function grub_calloc is not supplied. These parts must be aligned – neither part must require any functionality from the other part which is not actually there. But for most of it's functionality, it needs the second part. The first, most basic, part is the part that is started on bootup. On 'non-UEFI' systems, grub is installed in two separate parts. OK, thanks to lots of people ! Here's what I think I now understand. Is my best bet just to boot from a live CD and see if I can roll back the update to grub somehow? I noticed that this update also included 'firmware', not sure if that could be related. To me, 'symbol not found' implies some sort of build error with the grub package, but I don't really know how grub works. I'm dropped into the 'grub rescue' shell, but have no idea what to do there that might be useful. Just ran the latest batch of updates on 20.04 (Xubuntu), and now I'm getting a GRUB error: symbol 'grub_calloc' not found
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