Upgrade from 8.1.5 not possible

I would try to activate a ceph repository (in your case no-subscription). I once had problems updating without an active ceph repository, even if I didn't use it.

But don't use your deactivated Quincy repository, that version is EOL. Try Reef or Squid.
 
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I would try to activate a ceph repository (in your case no-subscription). I once had problems updating without an active ceph repository, even if I didn't use it.

But don't use your deactivated Quincy repository, that version is EOL. Try Reef or Squid.
Thx. Just tried, but still same situation