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

  • openSUSE Leap 15.6
  • gpk-update-viewer

after an update I always (?) get this error message:

GDBus.Error:org.freedesktop.PackageKit.Transaction.NotSupported: Cancel not supported by backend

any hints?

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:

AFAICS unrelated. I think the OP is meaning pkg-update-viewer, since the error message refers to Packagekit

Yes, I mean PackageKit, the system online updater tool and icon.

When using it, it gets and installs the updates — but in the end it shows the error message stated above.

For 15.6 you should use zypper up to update. Other installers may or may not work

Well, it runs the updates. It just produces that specific error message i don’t understand and cannot help by.

And besides, it’s pre-installed. Therefore, I assume it should work.

It works according to you:

Yes, it does so. So far, so good. But it throws the stated error message at the end (after applying the updates).