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OS: Ubuntu 18.04.5 LTS x86_64
Kernel: 4.15.0-135-generic
DE: MATE

When i run Software & Updates i get the following error:

You are not allowed to perform this action
You don't have the required privileges to perform this action.
org.freedesktop.PolicyKit.Error.Failed: ('system-bus-name', {'name': ':1.83'}): org.debian.apt.update-cache

When i run sudo /usr/lib/x86_64-linux-gnu/polkit-mate/polkit-mate-authentication-agent-1 i get

(polkit-mate-authentication-agent-1:3261): polkit-mate-1-WARNING **: 02:37:25.097: Unable to determine the session we are in: No session for pid 3261

When my desktop starts, i dont have a login screen. Not sure if it has anything to do with that.

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I updated to 20.04 now the error is gone

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