This started happening in F27 and the upgrade to F28 did not fix it.
The process /usr/bin/python3 /usr/bin/dnfdragora-updater is running but nothing is
showing in the systray and "System Tray Settings --> Entries" has no
dnfdragora entry.
Suggestion as how to troubleshoot?
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Conjecture is just a conclusion based on incomplete information. It isn't a fact.