I have been attempting to move my wiki from a server running Ubuntu 14.04, MediaWiki 1.19.14+dfsg-1, PHP 5.5.9-1ubuntu4.18 (apache2handler), MySQL 5.5.49-0ubuntu0.14.04.1 to a fresh install of Ubuntu 16.04, mediawiki 1.27. I copied the mediawiki.conf from the first server into /etc/apache2/conf-available/, modified it for the correct directory, loaded the mysql dump into mariadb, ran the update script (which completed without errors), added extensions the best I could (embedded video and math). The extensions don't seem to be working on the first brief showing of the page, before it goes blank. When I compare /tmp/wiki.logs, I see this, with the new not working wiki on the left, and the old working one on the right. There are no php errors, and I have the php.ini and LocalSettings.php set to show them.
I note that the new non-working wiki seems to do a shutdown after the request ended normally. Is this related to my problem?
I'm at a loss what to do from here. Maybe I should try and install the same version of wiki on each machine, and then try and upgrade the wiki. Any suggestions are welcome!