installed a little kde, it switched to it on the reboot, and most stuff is missing, no access to a shell of any kind

[Tom H]

>> For reference, to re-disable root
> Hit ctrl and d in the konsole or terminal - that logs you out back to normal
> user.

To log out of root. But if you have run "sudo passwd" and enabled root
and you later decide to disable it, you have to run wha tyou snipped
out.