This looks like there is a issue with the policykit agent:
2012-06-24 08:13:40,695 - softwarecenter.backend - WARNING -
_on_trans_error: org.freedesktop.PolicyKit.Error.Failed: ('system-bus-
name', {'name': ':1.103'}): org.debian.apt.install-or-remove-packages
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https://bugs.launchpad.net/bugs/1015797
Title:
Software-Center not working in 12.04
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