This also affects me while upgrading from 8.04.4 LTS to latest 10.04 LTS. I've
downloaded the ISO and started a cdrom upgrade.
Also worked for me after doing the fix suggested above by Emanuel Greisen:
rm /var/lib/dpkg/info/flashplugin-nonfree.prerm
dpkg --remove --force-remove-reinstreq flashplu
In my case, the lock screen fails to let me log in when entering the
correct password, so I have to restart the computer to gain access
again. I understand this is a similar bug. I've just upgraded from Saucy
to Trusty.
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