I am installing from githum kamailio 5.0 on my  ubuntu-16.04-x86_64 VPS. 

when I start the kamailio server I get this error :

/# /etc/init.d/kamailio start                                 [....] Starting kamailio (via systemctl): kamailio.serviceJob for kamailio.service failed because the control process exited with error code. See "systemctl status kamailio.service" and "journalctl -xe" for details.
 failed!

Ilooking up the status, I get this

 kamailio.service - Kamailio (OpenSER) - the Open Source SIP Server
   Loaded: loaded (/etc/systemd/system/kamailio.service; disabled; vendor preset: enabled)
   Active: failed (Result: exit-code) since Mon 2018-02-19 15:23:41 EST; 4h 10min ago
  Process: 18969 ExecStart=/usr/sbin/kamailio -P /var/run/kamailio/kamailio.pid -f $CFGFILE -m $SHM_MEMORY -M $PKG_MEMORY -u $USER -g $GR

Feb 19 15:23:41 khynepassion systemd[1]: Starting Kamailio (OpenSER) - the Open Source SIP Server...
Feb 19 15:23:41 khynepassion systemd[18969]: kamailio.service: Failed at step EXEC spawning /usr/sbin/kamailio: No such file or directory
Feb 19 15:23:41 khynepassion systemd[1]: kamailio.service: Control process exited, code=exited status=203
Feb 19 15:23:41 khynepassion systemd[1]: Failed to start Kamailio (OpenSER) - the Open Source SIP Server.
Feb 19 15:23:41 khynepassion systemd[1]: kamailio.service: Unit entered failed state.
Feb 19 15:23:41 khynepassion systemd[1]: kamailio.service: Failed with result 'exit-code'.