This bug was fixed in the package grub2 - 2.02~beta2-36ubuntu3.27
---------------
grub2 (2.02~beta2-36ubuntu3.27) xenial; 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 <[email protected]> Thu, 30 Jul 2020
21:27:00 -0700
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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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