This bug was fixed in the package grub2 - 2.04-1ubuntu29
---------------
grub2 (2.04-1ubuntu29) groovy; urgency=medium
* grub-install: cherry-pick patch from grub-devel to make grub-install
fault tolerant. Create backup of files in /boot/grub, and restore them
on failure to complete grub-install. LP: #1891680
* postinst.in: do not exit successfully when failing to show critical
grub-pc/install_devices_failed and grub-pc/install_devices_empty
prompts in non-interactive mode. This enables surfacing upgrade errors
to the users and/or automation. LP: #1891680
* postinst.in: Fixup postinst.in, to attempt grub-install upon explicit
dpkg-reconfigure grub-pc. LP: #1892526
-- Dimitri John Ledkov <x...@ubuntu.com> Tue, 01 Sep 2020 20:04:44
+0100
** Changed in: grub2 (Ubuntu Groovy)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1891680
Title:
grub-pc needs to detect when debconf points to invalid drive and stop
in preinst, before unpacking files, and also treat this as a failure
in postinst
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