Comment 7 for bug 313792

tsclient has been removed from the Ubuntu 11.10 archives. The software has not had a new release in years and was no longer being maintained. Unfortunately that means this bug won't be fixed.

More specifically, only a few bugs get fixed as Stable Release Updates (SRU). The SRU process requires that the bug be fixed first in the development first so that it is tested, but this app is not in the development release and it won't be coming back. I recommend you look for an alternative, such as remmina. Vinagre (which is already installed by default as Remote Desktop Viewer) should support VNC & RDP in Ubuntu 11.10. (Vinagre has already supported VNC for years.)