This bug was fixed in the package grub2 - 2.04-1ubuntu26.2
---------------
grub2 (2.04-1ubuntu26.2) focal; urgency=medium
* debian/postinst.in: Avoid calling grub-install on upgrade of the grub-pc
package, since we cannot be certain that it will install to the correct
disk and a grub-install failure will render the system unbootable.
LP: #1889556.
-- Steve Langasek <steve.langa...@ubuntu.com> Thu, 30 Jul 2020
17:34:25 -0700
** Changed in: grub2 (Ubuntu Focal)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1889556
Title:
grub-install failure does not fail package upgrade (and does not roll
back to matching modules)
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