I have a freshly built Ubuntu 18.04 server running Plex headless. I mounted share from Synology DS218j (8TB) NAS (192.168.1.99:/Storage/ → /home/user/Plex/).
I just made it scan all of my data overnight (music, movies, and tv shows) and it just refuses to apply metadata to some shows. I don’t know enough about it to go into detail. I have looked at the console and found tons of errors that look like this:
Error bringing media local (metadata://seasons/1/posters/com.plexapp.agents.thetvdb_a0ea5b17317083ab0bea584284804a1378b41022).
I have read other similar posts that explain this might be due to TheTVdb website updating their API. 
Server Version#: 1.16.3.1433
Player Version#: 4.01 (?)
Plex Media Server Logs_2019-08-03_03-21-48.zip (5.1 MB)