So…I think I may have solved the problem, but I’m confused by why it worked. I guess I should have poked around the logs myself before. I googled the error and read a bunch about it and one person tried disabling IPv6 on their machine. Since I already had a problem with IPv6 and apt-get on my machine I decided to follow some instructions to disable it on my machine in general. I went back to Plex and did a refresh of one movie and BOOM…posters!!
Now, I don’t understand networking very well but I find a few things odd:
-IPv6 is and was disabled on my Plex server
-In my Ubuntu network manager I set the IPv6 tab to ignore because I thought that would prevent my machine from using IPv6 (maybe this was an error)
-TV shows worked fine before I did this…
Hopefully this helps the next poor soul that spends hours trying to solve the same problem lol. Also maybe this should be in plex instructions somewhere unless I am responsible by disabling IPv6 in network manager…thats all I can think of