Comment 14 for bug 1290575

I installed a VM in VirtualBox of the 64bit version of Lubuntu yesterday Mar 18th using the daily iso pending download, and immediately saw this problem, but not at every boot or login. When it happened I had to logout and in again several times to get to a usable desktop, as those zombie processes appeared to stop me doing very much else, and I could find no way of killing the processes that worked either in terminal or with any GUI application

In an attempt to overcome it I installed, and tried to use xdm, but when using that it was impossible to get to a GUI desktop, or even a command line; just a black screen that would take no input.

From the grubmenu I booted to recovery mode and there purged xdm and I am now back to the lightdm-gtk-greeter which so far has not caused any more problems. I have aslso reinstalled lightdm-gtk-greeter to see if that has any effect, and will report back any progress or regression I see.