Running gpk-update-viewer for update: always (?) get error message at end

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2

You have an issue with Polkit. Read:

and find the problematic polkit privilege.

# journalctl |grep -i polkit
# pkaction -v > /tmp/test.txt

and check the content of /tmp/test.txt.

Here is a template of /etc/polkit-default-privs.local: