Seems like you fixed your /etc/default/grub between the bug occuring and
your report.
I suggest you visit ask.ubuntu.com, the forums, IRC, or another user
support for user support questions.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1901365
Title:
package grub-pc 2.02~beta2-36ubuntu3.28 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 127
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