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On 2 completely different machines I have the same problem after upgrading from 13.04 to 13.10: All programs/task requiering sudo permissions (software updater, starting synaptic, installing programs, shutdown) do not start / execute. No gksu (or other) window comes up. Synaptic never shows, software updater pops up with a "you are not allowed to perform this action" message.

All programs / task work when started from terminal with sudo, like "sudo synaptics" asks for my password, starts and works as expected.

I am in the admin group which is liked in sudoers config (verified with visudo and getent group admin).

Some link from GUI to gksu (or similar) is broken.

Braiam
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Radim
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    **gksu** is not installed by default in 13.04 or 13.10 see this question [Why is gksu no longer installed by default in 13.04?](http://askubuntu.com/q/284306/107450). But you can install it and its working for me in 13.10 – Warren Hill Oct 23 '13 at 12:22
  • The problem is likely polkit. Can you edit your question and add the following: `dpkg -l *policykit*`. Do not use comments for adding information. – Braiam Oct 28 '13 at 11:00

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I found the solution here

https://bugs.launchpad.net/ubuntu/+source/policykit-desktop-privileges/+bug/1240336/comments/19

sudo pam-auth-update --force
Gargoulf
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  • At least on 14.10, make sure "[*] Register user sessions in the systemd control group hierarchy" is selected in the dialog. After running the command, reboot the system. – Daniel Alder Nov 15 '14 at 17:23