Same here under Xubuntu 9.10 Alpha.
root@schlepptop:~/Desktop# nvidia-settings
VALIDATION ERROR: Data incomplete in file /etc/X11/xorg.conf. Undefined Device "(null)" referenced by Screen "Default Screen".
Segmentation fault (Speicherabzug geschrieben)
I will try the workaround described by Shang Wu.
Same here under Xubuntu 9.10 Alpha.
root@schlepptop :~/Desktop# nvidia-settings
VALIDATION ERROR: Data incomplete in file /etc/X11/xorg.conf.
Undefined Device "(null)" referenced by Screen "Default Screen".
Segmentation fault (Speicherabzug geschrieben)
I will try the workaround described by Shang Wu.