Pihole down after 4.0 fresh install

root@vps4:~# sudo service pihole-FTL restart
root@vps4:~# sudo service pihole-FTL status
● pihole-FTL.service - LSB: pihole-FTL daemon
   Loaded: loaded (/etc/init.d/pihole-FTL; generated; vendor preset: enabled)
   Active: active (exited) since Mon 2018-08-20 10:03:12 UTC; 5s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 19514 ExecStop=/etc/init.d/pihole-FTL stop (code=exited, status=0/SUC
  Process: 19520 ExecStart=/etc/init.d/pihole-FTL start (code=exited, status=0/S

Aug 20 10:03:11 vps4 systemd[1]: pihole-FTL.service: Failed to set invocation ID
Aug 20 10:03:11 vps4 systemd[1]: Starting LSB: pihole-FTL daemon...
Aug 20 10:03:11 vps4 pihole-FTL[19520]: Not running
Aug 20 10:03:11 vps4 su[19543]: Successful su for pihole by root
Aug 20 10:03:11 vps4 su[19543]: + ??? root:pihole
Aug 20 10:03:11 vps4 su[19543]: pam_unix(su:session): session opened for user pi
Aug 20 10:03:12 vps4 pihole-FTL[19520]: sh: 1: /usr/bin/pihole-FTL: Operation no
Aug 20 10:03:12 vps4 systemd[1]: Started LSB: pihole-FTL daemon.
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● pihole-FTL.service - LSB: pihole-FTL daemon
   Loaded: loaded (/etc/init.d/pihole-FTL; generated; vendor preset: enabled)
   Active: active (exited) since Mon 2018-08-20 10:03:12 UTC; 5s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 19514 ExecStop=/etc/init.d/pihole-FTL stop (code=exited, status=0/SUCCESS)
  Process: 19520 ExecStart=/etc/init.d/pihole-FTL start (code=exited, status=0/SUCCESS)

Aug 20 10:03:11 vps4 systemd[1]: pihole-FTL.service: Failed to set invocation ID on control group /system.slice/pihole-FTL.service, ignoring: Ope
Aug 20 10:03:11 vps4 systemd[1]: Starting LSB: pihole-FTL daemon...
Aug 20 10:03:11 vps4 pihole-FTL[19520]: Not running
Aug 20 10:03:11 vps4 su[19543]: Successful su for pihole by root
Aug 20 10:03:11 vps4 su[19543]: + ??? root:pihole
Aug 20 10:03:11 vps4 su[19543]: pam_unix(su:session): session opened for user pihole by (uid=0)
Aug 20 10:03:12 vps4 pihole-FTL[19520]: sh: 1: /usr/bin/pihole-FTL: Operation not permitted
Aug 20 10:03:12 vps4 systemd[1]: Started LSB: pihole-FTL daemon.

when i stop it:
Aug 20 10:06:00 vps4 pihole-FTL[19712]: Not running
Aug 20 10:06:00 vps4 su[19751]: Successful su for pihole by root
Aug 20 10:06:00 vps4 su[19751]: + ??? root:pihole
Aug 20 10:06:00 vps4 su[19751]: pam_unix(su:session): session opened for user pihole by (uid=0)
Aug 20 10:06:00 vps4 pihole-FTL[19712]: sh: 1: /usr/bin/pihole-FTL: Operation not permitted
Aug 20 10:06:00 vps4 systemd[1]: Started LSB: pihole-FTL daemon.
Aug 20 10:07:00 vps4 systemd[1]: pihole-FTL.service: Failed to set invocation ID on control group /system.slice/pihole-FTL.service, ignoring: Operation not permitted
Aug 20 10:07:00 vps4 systemd[1]: Stopping LSB: pihole-FTL daemon...
Aug 20 10:07:00 vps4 pihole-FTL[19812]: Not running
Aug 20 10:07:00 vps4 systemd[1]: Stopped LSB: pihole-FTL daemon.

even starting the binary as root doesn't work:

root@vps4:~# sudo /usr/bin/pihole-FTL
sudo: unable to execute /usr/bin/pihole-FTL: Operation not permitted