Follow this blog for 9.6 https://edwardsamuel.wordpress.com/2016/04/28/set-up-postgresql-9-5-master-slave-replication-using-repmgr/
Keep replication config separate as explained here.
While cloning slave use following:
POSTGRES_VERSION=9.6
sudo service postgresql stop
sudo -u postgres rm -r /var/lib/postgresql/${POSTGRES_VERSION}/main
sudo -u postgres repmgr -h repmgr_node1 -U repmgr -d repmgr -D /var/lib/postgresql/${POSTGRES_VERSION}/main -f /etc/repmgr.conf standby clone --copy-external-config-files=pgdata
# Do manually copy `postgresql.replication.conf` file also
sudo mv /var/lib/postgresql/${POSTGRES_VERSION}/main/pg_hba.conf /etc/postgresql/${POSTGRES_VERSION}/main/pg_hba.conf
sudo mv /var/lib/postgresql/${POSTGRES_VERSION}/main/postgresql.conf /etc/postgresql/${POSTGRES_VERSION}/main/postgresql.conf
sudo mv /var/lib/postgresql/${POSTGRES_VERSION}/main/pg_ident.conf /etc/postgresql/${POSTGRES_VERSION}/main/pg_ident.conf
sudo service postgresql start