This is a Ubuntu Precise + PHP 5.3 machine running MW. The next version of MW (1.27, scheduled for release in May) will not support PHP 5.3. I don't know if 5.5 has been backported to Precise but I guess we don't really want to leave the machine running Precise? I could do-release-upgrade to Trusty, or someone in ops could spin up a new VM (Jessie?).