The problem is simply that you had edited your /etc/default/grub file
and inserted some invalid text on this line:
GRUBboo# If you change this file, run 'update-grub' afterwards to update
Purging and reinstalling restored this file.
** Changed in: grub2 (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1265428
Title:
package grub-pc 1.99-21ubuntu3.14 failed to install/upgrade:
subprocess installed post-installation script returned error exit
status 127
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