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I use gnome desktop on Ubuntu 18.04. I want to delete a printer and rename another.

I would like to use the GUI under settings and devices to administer my printers.

Help page advice me to: "Click the Unlock button in the top-right corner and enter your password." But the Unlock button is not active. When hovering the mouse pointer above the button, it tells me that system policy prevents it, and that I should contact my system administrator.

How do I fix this?

I cannot unlock the button under users either. But in "Users Administration Tool" I am set to be administrator.

I found this post 12.04 - Cannot unlock user account although it is an admin account and executed this command:

ps -ef | grep [p]olkit 
root       993     1  0 aug22 ?        00:00:04 /usr/lib/policykit-1/polkitd --no-debug

But I don't know what to look for.

  • I tried to do this using xrdp, as I could not access my gnome desktop locally for some reason. I rename .Xauthority and was now able to access the gnome desktop locally. Now I'm also able to administer both printers and users. – Allan Bertelsen Aug 23 '18 at 10:25
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As an additional security measure, you need to log in to a physical seat to be able to unlock under the default configuration. If that is impossible, e.g. when the machine is virtual, you need to change the policies from ResultActive to ResultAny.

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