Ubuntu 12.10 desktop - software updater not starting

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http://askubuntu.com – I have a fully updated version of ubuntu 12.10 and am unable to start the "Software Updater" application, but am able to start the "Ubuntu Software Centre". I have tried $ sudo aptitude install update-manager and have also tried launching the update manager from the terminal using gksudo. I have also done the appropriate aptitude update and upgrade commands before trying the install of update manager. I get no error messages when performing $ sudo aptitude update etc. If anyone could help me getting started on resolving this issue then it would be much appreciated. Regards, Matt (HowTos)