Dpkg was interrupted, you must manually run 'dpkg-configure-a' to correct the problem

Dpkg was interrupted, you must manually run 'dpkg-configure-a' to correct
the problem

I was updating from 11.04 to 12.04 and I got this message:
Dpkg was interrupted, you must manually run 'dpkg-configure-a' to correct
the problem
now I can't connect to the net nor can I use a cursor on my laptop?