Здравствуйте,  у нас аналогичная проблема
при устновке на vps контейнер openvz , на  на дистрибутив centos7 , brainycp ломает сеть
установка завершается так
Configure Network Manager (NM)...
  Configure network interface.
  Service NetworkManager is down
после перезагрузки сети 
 systemctl status network.service
* network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: failed (Result: exit-code) since Wed 2018-08-29 09:56:10 UTC; 12s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 25130 ExecStop=/etc/rc.d/init.d/network stop (code=exited, status=0/SUCCESS)
  Process: 25252 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=1/FAILURE)
Aug 29 09:56:10 vps.domain.ru systemd-sysctl[25280]: Failed to write '16' to '/proc/sys/kernel/sysrq': Permission denied
Aug 29 09:56:10 vps.domain.ru systemd-sysctl[25280]: Failed to write '1' to '/proc/sys/kernel/core_uses_pid': Permission denied
Aug 29 09:56:10 vps.domain.ru network[25252]: Bringing up loopback interface:  RTNETLINK answers: File exists
Aug 29 09:56:10 vps.domain.ru network[25252]: [  OK  ]
Aug 29 09:56:10 vps.domain.ru network[25252]: Bringing up interface venet0:  Error: Connection activation failed: No suitable device found for ...nection.
Aug 29 09:56:10 vps.domain.ru network[25252]: [FAILED]
Aug 29 09:56:10 vps.domain.ru systemd[1]: network.service: control process exited, code=exited status=1
Aug 29 09:56:10 vps.domain.ru systemd[1]: Failed to start LSB: Bring up/down networking.
Aug 29 09:56:10 vps.domain.ru systemd[1]: Unit network.service entered failed state.
Aug 29 09:56:10 vps.domain.ru systemd[1]: network.service failed.
Hint: Some lines were ellipsized, use -l to show in full.
до установки
systemctl status NetworkManager
● NetworkManager.service
   Loaded: not-found (Reason: No such file or directory)
   Active: inactive (dead)
systemctl status network
● network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network)
   Active: active (exited) since Wed 2018-08-29 06:17:23 EDT; 30s ago
     Docs: man:systemd-sysv-generator(8)
  Process: 120 ExecStart=/etc/rc.d/init.d/network start (code=exited, status=0/SUCCESS)
Aug 29 06:17:23 vps.domain.ru systemd[1]: Starting LSB: Bring up/down networking...
Aug 29 06:17:23 vps.domain.ru network[120]: Bringing up loopback interface:  [  OK  ]
Aug 29 06:17:23 vps.domain.ru network[120]: Bringing up interface venet0:  arping: Device venet0 not available.
Aug 29 06:17:23 vps.domain.ru network[120]: [  OK  ]
Aug 29 06:17:23 vps.domain.ru systemd[1]: Started LSB: Bring up/down networking.
после установки и перезагрузке сети
# systemctl status NetworkManager
▒ NetworkManager.service - Network Manager
   Loaded: loaded (/usr/lib/systemd/system/NetworkManager.service; enabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:NetworkManager(8)
systemctl status network
▒ network.service - LSB: Bring up/down networking
   Loaded: loaded (/etc/rc.d/init.d/network; bad; vendor preset: disabled)
   Active: active (exited) since Wed 2018-08-29 10:17:23 UTC; 23min ago
     Docs: man:systemd-sysv-generator(8)
Aug 29 10:17:23 vps.domain.ru systemd[1]: Starting LSB: Bring up/down networking...
Aug 29 10:17:23 vps.domain.ru network[120]: Bringing up loopback interface:  [  OK  ]
Aug 29 10:17:23 vps.domain.ru network[120]: Bringing up interface venet0:  arping: Device venet0 not available.
Aug 29 10:17:23 vps.domain.ru network[120]: [  OK  ]
Aug 29 10:17:23 vps.domain.ru systemd[1]: Started LSB: Bring up/down networking.
			
			
									
									
						Прерывается установка на "Configure Network Manager..."
Re: Прерывается установка на "Configure Network Manager..."
Проблема решена , спасибо техподдержке! Но новых инсталляциях не появляется. 
Кто уже столкнулся - нужно выключить NetworkManager
systemctl stop NetworkManager
systemctl restart network
systemctl disable NetworkManager
systemctl enable network
			
			
									
									
						Кто уже столкнулся - нужно выключить NetworkManager
systemctl stop NetworkManager
systemctl restart network
systemctl disable NetworkManager
systemctl enable network