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We have done a fresh Ubuntu 16.04 LTS (64-bit) install on a machine I am using. My account has sudo permission and sudo works ok for me from the command line.

When I launch System Settings > Network from the Gnome desktop, and change the proxy configuration, I am prompted for my password:

System policy prevents setting proxy settings

My account name is correctly shown. But when I enter my password I see:

Your authentication attempt was unsuccessful please try again

Why is this failing when I have sudo access?

  • Add user to netdev group adduser user netdev – GAD3R Dec 12 '16 at 14:24
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  1. Add the user to netdev group:

    sudo adduser "$USER" netdev
    
  2. Log out and back in to apply the changes.

  3. Reload dbus:

    /etc/init.d/dbus reload
    
| improve this answer | |
  • Thanks for your reply. I tried your suggestion but the problem remains. – DavidA Dec 12 '16 at 14:59
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    @DavidA: You need to log out and back in to apply the user group membership change. See my edit to the answer. – David Foerster Dec 12 '16 at 15:41

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