What are some reasons why a Linux UF will get quarantined by the deployment manager:8089?
+1 on that question. Splunk architectural component is called Deployment Server, not deployment manager. And it doesn't quarantine anything. Quarantine can happen in various other situations though but they have nothing to do with DS.
So what and where is quarantined in your setup?
@splunkville It could be many things - usually I see this when queues are blocked. Could you please paste the ERROR here.
I hope this helps, if any reply helps you, you could add your upvote/karma points to that reply, thanks.