On first boot of mediawiki-vagrant with no roles enabled the php5-fpm server is installed an enabled, but not used. This conflicts with HHVM which uses the same port for fastcgi communication.

According to logs in /var/log/apt/history.log php5-fpm was installed due to the installation of php5-mysql. This requires php5 which requires one of several php5 SAPI's. Since apache has not yet installed libapache2-mod-php5 apt has to guess and in my case decided to install php5-fpm.

Version: unspecified
Severity: normal