As many of you are aware 1204 is in a state that it can be installed and tested. Expect things to break! Like today.
Some package changes were recently made that will break a regular apt-get update/dist-upgrade and leave you chasing your tail. To get past Update 28039 you will need to do the following:
dpkg --purge --force-depends mce-diskless-tools
apt-get -f install
This will bring you past the update and allow you to continue testing and providing feedback!