Trixie update, Grub broke?

Anssi Saari <[email protected]>
Newsgroups gmane.linux.debian.user
Organization An impatient and LOUD arachnid
Message-ID <[email protected]> 
I recently updated my Debian desktop to Trixie. It went fine but Grub
broke. It got as far as "Welcome to GRUB" then black screen and reboot.

I fixed that by doing grub-install and update-grub in a chroot but what
went wrong and can I avoid this annoyance in the future? Is this a known
problem? I remember seeing an off hand mention that this "often" happens
on Debian and derivatives but didn't pursue it then and don't have a
reference. And it's never happened to me before.
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