Не удается подключиться к PPTP VPN в Ubuntu 18.04

Я новичок в дистрибутивах Ubuntu и Linux и установил 18.04 LTS на рабочую станцию ​​vmware. У меня уже есть VPN-соединение, которое отлично работает с Windows-машиной. но если я настрою ту же учетную запись на моем компьютере с Ubuntu 18.04, это даст мне ошибку «сбой подключения vpn. сбой подключения к сети» Ниже приведена ошибка / var / log / syslog.

Nov 13 01:10:02 ubuntu NetworkManager[709]: <warn>  [1605258602.8234] vpn-connection[0x5642253585b0,89532b81-a556-43b5-9714-36997a8048d9,"KPVPN",0]: VPN connection: connect timeout exceeded.
Nov 13 01:10:02 ubuntu nm-pptp-service[2643]: Connect timer expired, disconnecting.
Nov 13 01:10:02 ubuntu pppd[2656]: Terminating on signal 15
Nov 13 01:10:02 ubuntu NetworkManager[709]: Terminating on signal 15
Nov 13 01:10:02 ubuntu NetworkManager[709]: Child process /usr/sbin/pptp 115.x.x.x --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-2643 (pid 2659) terminated with signal 15
Nov 13 01:10:02 ubuntu pppd[2656]: Child process /usr/sbin/pptp 115.x.x.x --nolaunchpppd --loglevel 0 --logstring nm-pptp-service-2643 (pid 2659) terminated with signal 15
Nov 13 01:10:02 ubuntu pppd[2656]: Connection terminated.
Nov 13 01:10:02 ubuntu NetworkManager[709]: Connection terminated.
Nov 13 01:10:02 ubuntu NetworkManager[709]: <info>  [1605258602.8374] vpn-connection[0x5642253585b0,89532b81-a556-43b5-9714-36997a8048d9,"KPVPN",0]: VPN service disappeared
Nov 13 01:10:02 ubuntu pppd[2656]: Exit.
Nov 13 01:10:02 ubuntu gnome-shell[880]: Removing a network device that was not added
Nov 13 01:10:02 ubuntu pptp[2665]: nm-pptp-service-2643 warn[decaps_hdlc:pptp_gre.c:226]: short read (-1): Input/output error
Nov 13 01:10:02 ubuntu pptp[2665]: nm-pptp-service-2643 warn[decaps_hdlc:pptp_gre.c:238]: pppd may have shutdown, see pppd log
Nov 13 01:10:02 ubuntu pptp[2673]: nm-pptp-service-2643 log[callmgr_main:pptp_callmgr.c:245]: Closing connection (unhandled)
Nov 13 01:10:02 ubuntu pptp[2673]: nm-pptp-service-2643 log[ctrlp_rep:pptp_ctrl.c:259]: Sent control packet type is 12 'Call-Clear-Request'
Nov 13 01:10:02 ubuntu pptp[2673]: nm-pptp-service-2643 log[call_callback:pptp_callmgr.c:84]: Closing connection (call state)
Nov 13 01:10:02 ubuntu NetworkManager[709]: <info>  [1605258602.8512] devices removed (path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Nov 13 01:10:02 ubuntu gnome-shell[1521]: Removing a network device that was not added

Подскажите, пожалуйста, в чем проблема и как ее решить.

/ Азим