The account I'm using is the first account on the system and it can use the sudo command. But when I'm trying to change anything in the User Settings program nothing happens. I can change my own password but not the other user's which I have created. Could this be because of that I'm using a NX remote session to administrate the computer? Or is there any settings which I have forgotten to do?
PolicyKit-based tools don't work over remote connections, as evidenced by the two following bugs: https://bugs.launchpad.net/ubuntu/+source/policykit/+bug/230656
https://bugs.launchpad.net/ubuntu/+source/policykit/+bug/614291
I'd suggest clicking the "this bug affects me too" link on the second one (since it is more generic than simply xdmcp, which is no longer supported by default) to get it higher on developers' radars.
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