I had the same problem.  It maybe caused by the proprietary driver being
unloaded and the dpkg losing it X connection.  On reboot I had to run X
in low graphics mode and then ran: sudo dpkg --configure -a

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package grub-pc 1.98-1ubuntu5 failed to install/upgrade: subprocess installed 
post-installation script returned error exit status 1
https://bugs.launchpad.net/bugs/569677
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