I've just attempted to open Synaptic Package Manager several times, without success. After I go into the Preferences menu and click on it, my cursor briefly shows that it's waiting or loading, but then it stops and nothing happens. I haven't had this problem with other applications that I can recall. I haven't tried anything besides just clicking on it in the menu; is there anything else I can try or any way I might be able to fix this problem?


Start Synaptic:


An Authentication Required window for authenticating with your user password will pop up.

If that doesn't work start maybe the authentication-agent is not running. Run the following commands to run the agent and start Synaptic:

sudo /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1
  • After entering the password I get the error "polkit-agent-helper-1: error responce to PolicyKit daemon: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: No session for cookie ==== AUTHENTICATION FAILED === Error executing command as another user: Not authorized" and "This incident has been reported." – Ilak Jul 7 '20 at 18:56
  • The preinstalled command is synaptic-pkexec. Maybe Wayland related issue. – N0rbert Jul 7 '20 at 18:59

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