I confirm the issue also affects tightvncserver (v1.3.9, there is a v1.3.10 but it does not seem to include its own /etc/X11/rgb.txt).
This missing file is causing a lot of cascading side effects (like lots of X apps not working when the X server cannot provide that name to color mapping). It took me several hours to find the real reason.
Downloading a rgb.txt file as suggested worked as workaround.
Using 9.04 with all updates, on i386 and amd64.
I confirm the issue also affects tightvncserver (v1.3.9, there is a v1.3.10 but it does not seem to include its own /etc/X11/rgb.txt).
This missing file is causing a lot of cascading side effects (like lots of X apps not working when the X server cannot provide that name to color mapping). It took me several hours to find the real reason.
Downloading a rgb.txt file as suggested worked as workaround.