The error in the logs is:
> /usr/sbin/grub-mkconfig: 12: /etc/default/grub: quiet: not found
> run-parts: /etc/kernel/postinst.d/zz-update-grub exited with return code 127
This indicates an incorrect manual edit of /etc/default/grub that has
broken the syntax of the file - not a bug in the grub package. You will
need to fix this file so that it declares variables using correct shell
syntax (no spaces around equal signs; quotes around any values that
contain spaces).
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1009771
Title:
package grub-pc 1.99-21ubuntu3.1 failed to install/upgrade: subprocess
installed post-installation script returned error exit status 127
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