You have edited this line in your /etc/default/grub file:
GRUB_CMDLINE_LINUX_DEFAULT=”quiet splash”
And you used slanted quotes. You need to use standard quotes.
** Changed in: grub2 (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1008390
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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