from the log you provided I'm unable to find what's the issue
can you please run "sudo dpkg --configure -a" and see if that fixes the issue?
thank you
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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package grub-pc 1.96+20080724-12ubuntu2 failed to install/upgrade: subprocess
post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/421770
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