Comment 1 for bug 788521

Hi Peter,

Thanks for reporting this issue and helping to make Ubuntu better. Potentially something went wrong during the upgrade so for now we'll assign this bug to update-manager.

Regardless, to help debugging the issue, we need the contents of /var/log/dist-upgrade/ (all files in there)

You can get them by booting a Live CD/USB image and copying them somewhere then uploading them here, or by actually getting yourself into your install. If you don't know how then it's essentially:

set root=(hdX,Y)
linux /vmlinuz root=/dev/sdXY ro
initrd /initrd.img
boot

(hdX,Y) depends on your configuration and needs to be found by first typing 'ls' at the grub prompt. You need to make an educated guess at which of the entries returned by ls is the right one.

I think the easiest way is LiveUSB, but please just attach the logs when available.