There seems to be a corrupted /boot/grub/grubenv. A common source for
this can be a hardware defect, or loose cable, or possibly turning off
power while in grub.
Deleting the file and running sudo grub-editenv list while create an
empty file, and allow you to continue.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1946097
Title:
package grub-common 2.04-1ubuntu26.13 failed to install/upgrade:
installed grub-common package post-installation script subprocess
returned error exit status 1
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