does not start from the menu, starts from terminal

[manishmahabir]

Binary package hint: gui-apt-key

gives the following error when starting from menu:
Failed to execute child process "/usr/bin/su-to-root" (No such file or directory)

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: gui-apt-key 0.4-2ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
NonfreeKernelModules: wl
Architecture: i386
Date: Mon May 9 20:15:46 2011
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_IN:en
 LANG=en_IN
 LC_MESSAGES=en_IN.UTF-8
 SHELL=/bin/bash
SourcePackage: gui-apt-key
UpgradeStatus: No upgrade log present (probably fresh install)