Sorry for the minimal detail - hopefully someone else will understand
this much better than I do, and be able to fill in if required. Failing
that, I might be able to do better later. Just spent many more hours on
this than anticipated, and need sleep.
I installed bullseye on my HP ProBook 430 G3 (attempting to encrypt
everything including /boot, but backed out of that - I don't think it
was relevant in the end) - using UEFI. Grub failed to install. I looked
at the logs on VT 3, and saw stuff about No space left on device. df
showed my devices all seemed fine.
It turned out that my NVRAM was full of dump files. I don't know what
they're for and why they had accumulated, but a page on the Arch wiki
suggested deleting them, which allowed grub to install.
Is it worth putting comments about that in the release notes? Or is it
too obscure a condition?