update broke KDE

i installed netrunner enigma and the first thing i did was run an update. I rebooted and i cant log in anymore - the kde plasma panel thing under the user at the log in screen is gone. Logging in results in the default ldm tokyo-looking background and nothing else. Any ideas what to do?

Did the update really run through completely ?
You could switch to one of the ttys (CTRL+F1 or F2 or F3 …) and login there. If you have a wired connection to the internet execute

sudo apt-get install -f