Looks like you still have -nvidia installed according to your report.
-nvidia itself needs updated to work with the new X stack so will be
uninstallable for a while. Remove it entirely then try the upgrade
again.
** Changed in: xorg-server (Ubuntu)
Status: New => Incomplete
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in ubuntu.
https://bugs.launchpad.net/bugs/711336
Title:
package xserver-xorg-core 2:1.9.0.902-1ubuntu4 failed to
install/upgrade: installing xserver-xorg-core would break existing
software
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