Comment 7 for bug 480439

It is possible that this has been fixed between Lucid and Maverick, but don't forget that Lucid desktop is supported until April 2013. Invalid may not be completely appropriate - we may need to create multiple targets/versions for this bug.

uname -srm is useful as a rough, initial way of knowing the state of someone's system. However since you seem competent with Ubuntu, what versions of the packages relevant to this bug are you using?