As far as we know these issue are all caused by the install_devices
debconf entry becoming invalid due to hardware configuration changes,
and then a subsequent upgrade in non-interactive mode failing due to
this.
Interactive upgrade or re-installation will simply prompt to specify the
new install device path.
A solution to make this nicer in the future is to use UUID based
install_devices tracking, but I consider this a new a feature instead,
and lowering priority to Medium
** Changed in: grub2 (Ubuntu)
Importance: Critical => Medium
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https://bugs.launchpad.net/bugs/1940723
Title:
GRUB (re)installation failing due to stale
grub-{pc,efi}/install_devices
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