On notebook of a friend of mine, the window decorations of his Xubuntu Hardy installation suddenly had gone. completely. You could open any application without problems - but you could not move or resize the windows.
[SOLUTION]
I was quite puzzled, and I still don't know how this happened, but thanks to an entry called "xcfe lost window decorations" on the ubuntuforums, I found out that it's the windows manager which isn't running.
In XFCE's case that's "xfwm".
So just open a shell and start the window manager again:
Code: Select all
$ xfwm4 --daemon