Today I installed postgresql 9.4 on Lubuntu 15.04 from the EnterpriseDB's package.
I modified pg_hba.conf to accept connections from the local network, and tried to start the backend. It do not; looking the log, I can see the message I copied to the subject. The full log entry is [/lib/systemd/system/postgresql-9.4.service:12] Unknown lvalue 'PIDFILE' in section 'Service'
But the corresponding entry in /lib/systemd/system/postgresql-9.4.service shows PIDFILE=/opt/PostgreSQL/9.4/data/postmaster.pid which is perfectly valid, because the data dir is Environment=PGDATA=/opt/PostgreSQL/9.4/data
