Since doing an update (Kubuntu 10.04), this message appears when attempting to log in;
Warning: cannot open ConsoleKit session: Unable to open session: the permission of the setuid helper is not correct.
How do I fix this?
And what is a setuid helper?

After clicking ok on the above warning, the system logs in, but gives 2 error messages;
- removed sound devices
- KNetworkManager cannot start because the installation is misconfigured. System DBUS policy does not allow it to provide user settings. contact your system administrator or distribution. KNetworkManager will not start automatically in future.

Please, any tips on solving this?