[VERIFICATION BIONIC]

Installation works fine using the proposed package.
Both glusterd and glustereventsd are disabled by default and can easily be enabled (permanently) and/or simply started manually (temporarily), exactly like successor package starting with Cosmic and late.

# apt-get install glusterfs-server -y
...
Setting up python-chardet (3.0.4-1) ...
Setting up python-cryptography (2.1.4-1ubuntu1.3) ...
Setting up python-requests (2.18.4-2ubuntu0.1) ...
Setting up python-openssl (17.5.0-1ubuntu1) ...
Setting up glusterfs-common (3.13.2-1ubuntu1) ...
Adding group `gluster' (GID 116) ...
Done.
Setting up glusterfs-client (3.13.2-1ubuntu1) ...
Setting up glusterfs-server (3.13.2-1ubuntu1) ...
glusterd.service is a disabled or a static unit, not starting it.
glustereventsd.service is a disabled or a static unit, not starting it.
Processing triggers for libc-bin (2.27-3ubuntu1) ...
Processing triggers for ureadahead (0.100.0-21) ...
Processing triggers for systemd (237-3ubuntu10.21) ...


# dpkg -l | grep -i gluster
ii  glusterfs-client               3.13.2-1ubuntu1                   amd64        clustered file-system (client package)
ii  glusterfs-common               3.13.2-1ubuntu1                   amd64        GlusterFS common libraries and translator modules
ii  glusterfs-server               3.13.2-1ubuntu1                   amd64        clustered file-system (server package)


# systemd unit "glustereventsd"

# systemctl status glustereventsd.service
● glustereventsd.service - Gluster Events Notifier
   Loaded: loaded (/lib/systemd/system/glustereventsd.service; disabled; vendor preset: enabled)
   Active: inactive (dead)

# systemctl start glustereventsd.service

# systemctl status glustereventsd.service
● glustereventsd.service - Gluster Events Notifier
   Loaded: loaded (/lib/systemd/system/glustereventsd.service; disabled; vendor preset: enabled)
   Active: active (running) since Mon 2019-06-03 20:01:01 UTC; 1s ago
 Main PID: 5950 (glustereventsd)
    Tasks: 2 (limit: 4915)
   CGroup: /system.slice/glustereventsd.service
           ├─5950 /usr/bin/python2 /usr/sbin/glustereventsd --pid-file /var/run/glustereventsd.pid
           └─5951 /usr/bin/python2 /usr/sbin/glustereventsd --pid-file /var/run/glustereventsd.pid

Jun 03 20:01:01 glustersproposed systemd[1]: Started Gluster Events Notifier.



# systemd unit "glusterd"

# systemctl status glusterd.service
● glusterd.service - GlusterFS, a clustered file-system server
   Loaded: loaded (/lib/systemd/system/glusterd.service; disabled; vendor preset: enabled)
   Active: inactive (dead)

# systemctl starts glusterd.service

# systemctl status glusterd.service
● glusterd.service - GlusterFS, a clustered file-system server
   Loaded: loaded (/lib/systemd/system/glusterd.service; disabled; vendor preset: enabled)
   Active: active (running) since Mon 2019-06-03 20:00:31 UTC; 6s ago
  Process: 5858 ExecStart=/usr/sbin/glusterd -p /var/run/glusterd.pid --log-level $LOG_LEVEL $GLUSTERD_OPTIONS (code=e
 Main PID: 5859 (glusterd)
    Tasks: 8 (limit: 4915)
   CGroup: /system.slice/glusterd.service
           └─5859 /usr/sbin/glusterd -p /var/run/glusterd.pid --log-level INFO

Jun 03 20:00:29 glustersproposed systemd[1]: Starting GlusterFS, a clustered file-system server...
Jun 03 20:00:31 glustersproposed systemd[1]: Started GlusterFS, a clustered file-system server.