"Send CTRL+ALT+DEL" is not an option

The helpfile states:

"When the Keyboard shortcuts option is disabled, Ctrl+Alt+Delete is the only key combination which will not be sent to the remote desktop. Choose Remote ▸ Send Ctrl-Alt-Delete, or use the corresponding toolbar button, to send this key combination."

The problem being that this isn't an option. The entry isn't even listed in the Remote menu.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: rdesktop 1.7.0-1ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30
Uname: Linux 3.2.0-32-generic x86_64
NonfreeKernelModules: fglrx wl
ApportVersion: 2.0.1-0ubuntu14
Architecture: amd64
Date: Sun Nov 4 19:58:26 2012
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: rdesktop
UpgradeStatus: No upgrade log present (probably fresh install)