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I have the same issue... nzbget responds with "Unrar error code: 5". I'm currently on 8.5.8 on GCE. I changed diskspace settings to "0" to skip the check for disk space, which helped initially, but now all attempts fails related to error 5 space.
I was able to resolve by forcefully deleting all files in the /mnt/incomplete/nzbget directory. Once I removed all files, the problem was resolved. Will monitor and post back if things change.
Since I'm new to Linux, I'll share the steps I followed in case it helps others:
terminal into the linux server (in my case, GCE)
navigate to the directory using "cd /mnt/incomplete/nzbget" command
list all items using "ls" command (not needed, but I wanted to see what was taking up space)
delete all items using "rm -r *" command
Question: is there a scheduled job/task that automatically deletes incomplete downloads? I have the Download Client - Remove option enabled in both Sonarr and Radarr, but I did see a bunch of files listed which I manually deleted.