*** This bug is a duplicate of bug 484499 ***
https://bugs.launchpad.net/bugs/484499
The terminal log says:
/etc/default/grub: 33: Syntax error: EOF in backquote substitution
It seems that you've edited /etc/default/grub in a way that made its
syntax invalid. You need to edit it again and
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https://bugs.launchpad.net/bugs/694446
Title:
package grub-pc 1.98+20100804-5ubuntu3 failed to install/upgrade: subprocess
installed post-installation script returned error exit