Description of problem: I installed a VirtualBOX virtual machine to test the upgrade with yum from Fedora 17 KDE to Fedora 18 KDE. The upgrade process has been completed correctly, but, when I rebooted into F18, I had only a text mode login (tty1), not KDM login. Doing a yum distro sync I don't get any downgrade. Version-Release number of selected component (if applicable): Kernel 3.6.0-0.rc6.git0.2.fc18.x68_64
Not a bug. It was a missing vboxdrv module