Changing Window Manager in Login screen
I have just installed Ubuntu 12.10 and have added a number of Window managers.
The window manages are normally changed from the login screen and are selected from a menu, the last entry of which says "Select this desktop" (or something similar).
I suspect that I have too many Desktop Environments to choose from because this last menu item no longer appears with the result that I am unable to change the Window Manager.
Where is the file that specifies the current Window manager?
Every blasted issue of Ubuntu appears to store system parameters in a different place, no doubt to keep us on our toes.