[ubuntu] Software Centre authentication error

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http://ubuntuforums.org – Hi all. First apologies if this is posted in the wrong area. I recently installed Ubuntu 12.10. I have since added a few repositories while installing various software. However when I try to install anything from Software Centre I get the following error: Quote: Software can't be installed or removed because the authentication service is not available. (org.freedesktop.PolicyKit.Error.Failed: ('system-bus-name', {'name': ':1.68'}): org.debian.apt.install-or-remove-packages Can anyone help me remedy this please. (Hardware)