Как настроить L2TP / IPsec VPN на Ubuntu 18.04 gui? [закрыто]

Я пытаюсь сделать L2TP / IPsec VPN доступным в графическом интерфейсе в сетевых настройках Ubuntu 18.04, но безуспешно. Я пробовал следующее:

$ sudo apt-get install network-manager-l2tp  
Reading package lists... Done
Building dependency tree       
Reading state information... Done
network-manager-l2tp is already the newest version (1.2.8-2build1).
0 upgraded, 0 newly installed, 0 to remove and 99 not upgraded.

и

$ sudo apt-get install network-manager-l2tp-gnome
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
  network-manager-l2tp-gnome
0 upgraded, 1 newly installed, 0 to remove and 99 not upgraded.
Need to get 24,7 kB of archives.
After this operation, 147 kB of additional disk space will be used.
Get:1 http://ro.archive.ubuntu.com/ubuntu bionic/universe amd64 network-manager-l2tp-gnome amd64 1.2.8-2build1 [24,7 kB]
Fetched 24,7 kB in 0s (217 kB/s)                
Selecting previously unselected package network-manager-l2tp-gnome.
(Reading database ... 246523 files and directories currently installed.)
Preparing to unpack .../network-manager-l2tp-gnome_1.2.8-2build1_amd64.deb ...
Unpacking network-manager-l2tp-gnome (1.2.8-2build1) ...
Setting up network-maniager-l2tp-gnome (1.2.8-2build1) ...

, но безуспешно. Что мне не хватает в Ubuntu 18.04?