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When I try to run synaptic-pkexec, I get this.

andy@7 ~> synaptic-pkexec
==== AUTHENTICATING FOR com.ubuntu.pkexec.synaptic ===
Authentication is required to run the Synaptic Package Manager
Authenticating as: andy,,, (andy)
Password: 
polkit-agent-helper-1: error response to PolicyKit daemon: GDBus.Error:org.freedesktop.PolicyKit1.Error.Failed: No session for cookie
==== AUTHENTICATION FAILED ===
Error executing command as another user: Not authorized

This incident has been reported.
andy@7 ~> 
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  • 1
    Are you running this inside a mate desktop, or at a CLI terminal? Is mate-polkit running? what is the output of pgrep -af polkit? Commented Jan 3 at 14:27
  • andy@7 ~> pgrep -af polkit 1039 /usr/libexec/polkitd --no-debug 2409 /usr/lib/x86_64-linux-gnu/polkit-mate/polkit-mate-authentication-agent-1 @steeldriver
    – fixit7
    Commented Jan 3 at 16:52

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