Thanks for the infos. So that's really a problem with PolicyKit or it's configuration files. Pretty hard to guess where the problem may come from.
Please check that your /etc/polkit-1/localauthority.conf.d/51-ubuntu-admin.conf file contains, > [Configuration] > AdminIdentities=unix-group:admin and check that users you tried to authenticate with are members of the 'admin' group. Also have a look at all files in /etc/polkit-1/ and check there's nothing weird. Please also post the outputs of: pkcheck --action-id org.freedesktop.systemtoolsbackends.set --allow-user-interaction --process PID pkcheck --action-id com.ubuntu.systemservice.setproxy --allow-user-interaction --process PID replacing PID with the PID of any process you own. Do the same with a process owned by root (calling the tool with sudo). If you get an error about an authentication agent, please start /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1 and retry. ** This bug is no longer a duplicate of bug 295405 Fails to run lib/dbus-1.0/dbus-daemon-launch-helper: not owned by the messagebus group ** Package changed: system-tools-backends (Ubuntu) => policykit-1 (Ubuntu) ** Summary changed: - Failed to execute program /lib/dbus-1.0/dbus-daemon-launch-helper: Success + PolicyKit authentication always fails -- PolicyKit authentication always fails https://bugs.launchpad.net/bugs/598909 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs