It seems your grub file is not correct.  You could attempt to remedy the
problem by following a guide such as this:
https://help.ubuntu.com/community/GrubHowto#Backup,%20Repairing%20and%20Reinstalling%20GRUB

I hope that fixes your problem.

Unfortunately without more information on what caused the issue, there
isn't much we can do right now.

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Several bugs on upgrade
https://bugs.launchpad.net/bugs/253704
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