Please do in the Terminal (Applications > Accessories > Terminal) and please
copy the output:
(copy & paste, it´s for repair all packages)
sudo dpkg --configure -a
Thank You for making Ubuntu better.
** Changed in: grub2 (Ubuntu)
Status: New => Incomplete
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must manually run 'sudo dpkg--configure-a'
https://bugs.launchpad.net/bugs/511463
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