On my side, everything seems to work very well but I have not tested all the possibilities of the distribution. I am going/learning slowly but surely 
I launched the command lines one after the other and here are the outputs :
user@host:~$ sudo systemctl status virtualbox-guest-utils
● virtualbox-guest-utils.service - Virtualbox guest utils
Loaded: loaded (/lib/systemd/system/virtualbox-guest-utils.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2018-09-18 10:26:04 UTC; 11min ago
Process: 596 ExecStart=/etc/init.d/virtualbox-guest-utils start (code=exited, status=203/EXEC)
sep 18 10:26:03 host systemd[1]: Starting Virtualbox guest utils...
sep 18 10:26:04 host systemd[1]: virtualbox-guest-utils.service: Control process exited, code=exited status=203
sep 18 10:26:04 host systemd[1]: Failed to start Virtualbox guest utils.
sep 18 10:26:04 host systemd[1]: virtualbox-guest-utils.service: Unit entered failed state.
sep 18 10:26:04 host systemd[1]: virtualbox-guest-utils.service: Failed with result 'exit-code'.
user@host:~$ sudo systemctl restart virtualbox-guest-utils
Job for virtualbox-guest-utils.service failed because the control process exited with error code.
See "systemctl status virtualbox-guest-utils.service" and "journalctl -xe" for details.
user@host:~$
user@host:~$ sudo systemctl status virtualbox-guest-utils
● virtualbox-guest-utils.service - Virtualbox guest utils
Loaded: loaded (/lib/systemd/system/virtualbox-guest-utils.service; enabled; vendor preset: enabled)
Active: failed (Result: exit-code) since Tue 2018-09-18 10:39:31 UTC; 45s ago
Process: 2596 ExecStart=/etc/init.d/virtualbox-guest-utils start (code=exited, status=203/EXEC)
sep 18 10:39:31 host systemd[1]: Starting Virtualbox guest utils...
sep 18 10:39:31 host systemd[1]: virtualbox-guest-utils.service: Control process exited, code=exited status=203
sep 18 10:39:31 host systemd[1]: Failed to start Virtualbox guest utils.
sep 18 10:39:31 host systemd[1]: virtualbox-guest-utils.service: Unit entered failed state.
sep 18 10:39:31 host systemd[1]: virtualbox-guest-utils.service: Failed with result 'exit-code'.
user@host:~$ sudo journalctl -u virtualbox-guest-utils | cat
-- Logs begin at Tue 2018-09-18 10:25:54 UTC, end at Tue 2018-09-18 10:40:45 UTC. --
sep 18 10:26:03 host systemd[1]: Starting Virtualbox guest utils...
sep 18 10:26:04 host systemd[1]: virtualbox-guest-utils.service: Control process exited, code=exited status=203
sep 18 10:26:04 host systemd[1]: Failed to start Virtualbox guest utils.
sep 18 10:26:04 host systemd[1]: virtualbox-guest-utils.service: Unit entered failed state.
sep 18 10:26:04 host systemd[1]: virtualbox-guest-utils.service: Failed with result 'exit-code'.
sep 18 10:39:31 host systemd[1]: Starting Virtualbox guest utils...
sep 18 10:39:31 host systemd[1]: virtualbox-guest-utils.service: Control process exited, code=exited status=203
sep 18 10:39:31 host systemd[1]: Failed to start Virtualbox guest utils.
sep 18 10:39:31 host systemd[1]: virtualbox-guest-utils.service: Unit entered failed state.
sep 18 10:39:31 host systemd[1]: virtualbox-guest-utils.service: Failed with result 'exit-code'.