Per https://help.ubuntu.com/community/DebuggingXAutoconfiguration the
following workaround did work for me:

$ sudo dpkg-reconfigure -phigh xserver-xorg
...choose defaults for everything

$ sudo vi /etc/X11/xorg.conf
...in the section "Monitor" (around line 100 in my file), insert these lines 
before EndSection
  HorizSync 36-52
  VertRefresh 36-60

$ sudo /etc/init.d/gdm restart
...may need to do that twice - the first restart failed for me, probably due to 
a stray pid file or something like that.

-- 
desktop cd fails to start gdm with hp nc6400 (widescreen, ati-based laptop)
https://bugs.launchpad.net/bugs/103945
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