Changed the add-on in xdrp on the server in precise / 12.04 from tightvncserver to vnc4server, and the problem disappeared. Thus it was tightvncserver causing the error.
** Package changed: rdesktop (Ubuntu) => tightvnc (Ubuntu) ** Summary changed: - lucid tsclient channel_register error on connecting to precise + tightvnc sends bad request causing rdesktop and/or remmina to crash with Unity -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to rdesktop in Ubuntu. https://bugs.launchpad.net/bugs/1080006 Title: tightvnc sends bad request causing rdesktop and/or remmina to crash with Unity Status in “tightvnc” package in Ubuntu: New Bug description: I have now set up a local precise machine. I use xrdp to connect to the new box. On the old machine, I use tsclient in lucid. All is fine and dandy till I try to launch an application in the precise screen. At that moment, tsclient stops, and tries a reconnect. Below the logging after starting tsclient from the command line. ** (tsclient:11817): WARNING **: Autoselected keyboard map en-us ERROR: channel_register WARNING: Initializing sound-support failed! X Error of failed request: BadAtom (invalid Atom parameter) Major opcode of failed request: 23 (X_GetSelectionOwner) Atom id in failed request: 0x0 Serial number of failed request: 29974 Current serial number in output stream: 29974 ** (tsclient:11817): WARNING **: Autoselected keyboard map en-us ERROR: channel_register WARNING: Initializing sound-support failed! X Error of failed request: BadAtom (invalid Atom parameter) Major opcode of failed request: 23 (X_GetSelectionOwner) Atom id in failed request: 0x0 Serial number of failed request: 30804 Current serial number in output stream: 30804 (tsclient:11817): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.24.1/gobject/gsignal.c:2390: instance `0x965f8e0' has no handler with id `1162' ** (tsclient:11817): WARNING **: Autoselected keyboard map en-us ERROR: channel_register WARNING: Initializing sound-support failed! X Error of failed request: BadAtom (invalid Atom parameter) Major opcode of failed request: 23 (X_GetSelectionOwner) Atom id in failed request: 0x0 Serial number of failed request: 33698 Current serial number in output stream: 33698 (tsclient:11817): GLib-GObject-WARNING **: /build/buildd/glib2.0-2.24.1/gobject/gsignal.c:2390: instance `0x965f9c0' has no handler with id `2388' To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/tightvnc/+bug/1080006/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp

