It looks like the machine frozen in the middle of the upgrade and the upgrade could not be completted. A way to recover is to boot from the live-cd, mount your root filesystem and chroot into it. Then run there:
$ sudo dpkg --configure -a
$ sudo apt-get install -f
$ sudo apt-get dist-upgrade
Thanks for your bugreport.
It looks like the machine frozen in the middle of the upgrade and the upgrade could not be completted. A way to recover is to boot from the live-cd, mount your root filesystem and chroot into it. Then run there:
$ sudo dpkg --configure -a
$ sudo apt-get install -f
$ sudo apt-get dist-upgrade