I just installed x2go server in kubuntu 12.10 x64 and can connect without problems.

Problem is when I tryed to run something app using kdesudo o sudo I allways get:

X Error: BadAccess (attempt to access private resource denied) 10

  Extension:    129 (MIT-SHM)

  Minor opcode: 1 (X_ShmAttach)

  Resource id:  0x4000010

X Error: BadShmSeg (invalid shared segment parameter) 128

  Extension:    129 (MIT-SHM)

  Minor opcode: 5 (X_ShmCreatePixmap)

  Resource id:  0x40000ab

X Error: BadDrawable (invalid Pixmap or Window parameter) 9

...

...

...

And only can see the app's windows with a full grey color inside. If the app background got more than one colour I can see them but no controls

I can confirm the same issue in other kubuntu 12.10 server updated from 12.04

I'm using x2goserver from stable x2go ppa and system are full update.