Comment 16 for bug 517803

i have tried all these replies and nothing worked for me.i was very close to reinstallation,but....
i typed in the terminal :
sudo apt-get install gnome

there was some time installing and then there was a window asking whitch desktop manager i want to set as a default
i didn't chose neither gnome or kde... i chose lightkdm, installation continued untill it was done

sudo reboot and when the lightkmd showes up chosed kubuntu-desktop session and....MAGIC !!! everything workes juuuust fine now...

i feel so good finding this on my own

i hope it will help somebody else !!!

bob's not my f****n uncle !