It appears there must be something in my control panel software, I'm using Sentora. It is a Cpanel like program.I setup another server, installed just LAMP. Then installed osTicket and it is working perfectly. Since these are both the exact same versions of Ubuntu, just installing the apache, php, mysql, etc services differently, I'm going to assume that it has to be something in the way the Sentora installer runs.Note to any other Sentora users, plugins are not working correctly.@[deleted], thanks for sticking with me as I worked through this issue!