I solved this problem by first recreating the xorg.conf using nvidia xconfig tool:
sudo nvidia-xconfig and then executing nvidia-settings as root (or setting write permissions to xorg.conf and possibly the /etc/X11 directory itself to your user, perhaps using posix acl) -- Failed to parse existing X config file '/etc/X11/xorg.conf'! https://bugs.launchpad.net/bugs/469729 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs