This bug is well described on the freedesktop.org bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=54654
In short, the cursor can't move beyond one screen when a server is running multiple X screens. The bug has been fixed upstream; the fix should be applied to all Ubuntu releases using a 1.13 X server.
This bug is well described on the freedesktop.org bugzilla: https:/ /bugs.freedeskt op.org/ show_bug. cgi?id= 54654
In short, the cursor can't move beyond one screen when a server is running multiple X screens. The bug has been fixed upstream; the fix should be applied to all Ubuntu releases using a 1.13 X server.