The pop up window "Error: Orbiter failed to initialize OpenGL" keep poping up. And, no whereelse you can go. How to change the setting to UI1?
I'd like an answer to this too - I have exactly the same problem. The first time I installed I chose the third option and got a similar pop up window. So I re-installed all over again and chose option 2. Still get an error. So much for an easy install. I didn't expect the problems to start at this point

One way forward is to edit the /etc/X11/xorg.conf file and change the text between the quotes that reads "nvidia" below to "nv";
Section "Device"
Identifier "nVidia GeForce 6200 TurboCache(TM)"
Driver "nvidia"
BusID "PCI:1:0:0"
Option "ConnectedMonitor" "DFP"
EndSection
...change it to;
Section "Device"
Identifier "nVidia GeForce 6200 TurboCache(TM)"
Driver "nv"
BusID "PCI:1:0:0"
Option "ConnectedMonitor" "DFP"
EndSection
Now save the xorg.conf file and reboot... this will now boot your Core with the Open 'nv' driver which is fine for UI1 and UI1 with overlay. In fact video performance seems much better than the nVidia drivers in terms of video playback quality (ie no video tearing and good smooth frame rates even at 720p).
Andrew