this seems to be the root-cause…
most likely, you replaced the new /var/lib/openhab2/config/org/apache/karaf/features.config (pointing to M6 mvn repos) with the old one (pointing to M5 mvn repos)
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Worked for Me to thanks
Likewise, thanks heaps for the post - had me well confused! For completeness… it happened to me when reinstalling OpenHAB2, then restoring from an openhab backup (had back in October), then restoring userdata and config over the top (which I had a copy of from a few days ago) Your instructions cleaned up 99% of my issues up. Cheers