Your /etc/default/grub is broken, fix it. Seems like it is merged wrong.
You can see it starts again after the first third of the file:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash # If you change this file, run
'update-grub' afterwards to update
^ this is the beginning of the file
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1901304
Title:
package grub-pc 2.02~beta2-36ubuntu3.28 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 2
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