$ sudo /etc/init.d/postgresql restart
 * Restarting PostgreSQL 9.6 database server                                                                                   * Failed to issue method call: Unit postgresql@9.6-main.service failed to load: No such file or directory. See system logs and 'systemctl status postgresql@9.6-main.service' for details.

$ sudo service postgresql start
 * Starting PostgreSQL 9.6 database server                                                                                                         * Failed to issue method call: Unit postgresql@9.6-main.service failed to load: No such file or directory. See system logs and 'systemctl status postgresql@9.6-main.service' for details.    [fail]



(env) dominic@dom-Inspiron-7559:~/Desktop/Project
    $ systemctl status postgresql@9.6-main.service
    Failed to issue method call: No such interface 'org.freedesktop.DBus.Properties' on object at path /org/freedesktop/systemd1/unit/postgresql_409_2e6_2dmain_2eservice


$ pg_config --version
PostgreSQL 11.2 (Ubuntu 11.2-1.pgdg14.04+1)

$ pg_lsclusters
Ver Cluster Port Status Owner    Data directory               Log file
9.6 main    5432 down   postgres /var/lib/postgresql/9.6/main /var/log/postgresql/postgresql-9.6-main.log


$ sudo pg_ctlcluster 9.6 main start
Failed to issue method call: Unit postgresql@9.6-main.service failed to load: No such file or directory. See system logs and 'systemctl status postgresql@9.6-main.service' for details.

$ sudo systemctl daemon-reload