Comment 29 for bug 251709

Found a solution that will at least temporarily allow using rdesktop with this patch per http://ubuntuforums.org/showthread.php?t=977663&page=2 shamelessly (ripped from Xires' post). Modifying as specified below will at least allow users to work around this bug (or at least I haven't hit an issue yet). The latest Debian unstable package is another option...

--- /usr/share/rdesktop/keymaps/common.orig 2009-01-15 12:32:10.000000000 -0600
+++ /usr/share/rdesktop/keymaps/common 2009-01-15 12:00:40.000000000 -0600
@@ -225,5 +225,6 @@
#
# Inhibited keys
#
-Caps_Lock 0x0 inhibit
+#Caps_Lock 0x0 inhibit
+Caps_Lock 0x3a capslock
Multi_key 0x0 inhibit