gdm v. kdm v. xdm

[nub]

John DeCarlo wrote:

>Hello,
>
>I recently installed kubuntu-desktop and the install asked a question
>about which should be the default manager, but I forget what I
>answered (duh).
>
>Anyway, now it won't start the graphical login.  The message is that
>xdm is not the default manager, so it won't start.
>
>How should I fix this problem?  I would prefer a graphical login that
>allowed me to select whether to use Gnome or KDE.
>
>Thanks.
>
>  
>
try reinstalling kdm (or gdm) via apt-get