Yes, xserver-xgl is installed. On the forums, ROAF suggested
DISPLAY=:0 nvidia-settings
This works for me, and I am able again to configure both my screens to
work(!).
--
gutsy: nvidia-new -- nvidia-settings no longer works
https://bugs.launchpad.net/bugs/144750
You received this bug
*** This bug is a duplicate of bug 63602 ***
https://bugs.launchpad.net/bugs/63602
** This bug has been marked a duplicate of bug 63602
aticonfig command fails under Xgl
--
gutsy: nvidia-new -- nvidia-settings no longer works
https://bugs.launchpad.net/bugs/144750
You received this bug
Do you have the xserver-xgl package installed? If so, this is normal
behaviour and a duplicate of bug #63602.
You can check whether you have this package installed in Synaptic, or by
running dpkg --list xserver-xgl at a terminal - if you have it installed the
output will include something
