Comment 84 for bug 1240336

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Shubham Lakshetti (laksh) wrote : Re: After release upgrade, the user looses permissions for several basic actions in the system

Actually, it works for installing packages from software center (auth dialog
appears), still fails silently sometimes (for example when I try to remove
software source PPA).

I also created a new admin user, by running sudo gnome-control-center ->
Users & Groups.
For that user everything works fine.

This appears to be a recurring bug which has been reported on Launchpad back in 2013. Every version of ubuntu since is affected by this but not everyone sees the error. On the moment I write this (march 2015) there's no permanent solution, however there are workarounds to solve the problem.

For Ubuntu 14.10 the problem appears to be related to the package ulatencyd. Removing this package causes the error to disappear in my situation. If I recall correctly I've installed this package manually on a certain moment in time so it does not belong to a standard install and therefore this might not affect everyone.