I now understand what happened. The installer creates (by default) an EFI
install, with grub-efi-amd64. The automatic update replaces grub-efi with
grub-pc, and the latter doesn't work. I manually reinstalled grub-efi and
everything works now.
But something is clearly wrong: an automatic update shouldn't be breaking a
clean install. So, what went wrong here? Is it a bug in the installer? in grub?
in apt? Should I have done anything differently during installation?
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
** Converted to question:
https://answers.launchpad.net/ubuntu/+source/grub2/+question/166162
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https://bugs.launchpad.net/bugs/814412
Title:
Grub update renders system unbootable
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