Replace APC with APCu on Ubuntu 14 and later
In php.yml the task PHP | Cache configuration file, apc.ini
installs apc and we should replace that:
- see https://github.com/owncloud/core/issues/14175#issuecomment-74573088
- wget https://launchpad.net/
ondrej/+archive/ubuntu/php5/+build/6149263/+files/php5-apcu_4.0.6-1%2Bdeb.sury.orgutopic%2B1_amd64.deb - sudo dpkg -i php5-apcu_4.0.6-1+deb.sury.org~utopic+1_amd64.deb