Ubuntu 18.04 のサーバに、OpenVPN をセットアップします。

root@bionic-openvpn:~# apt install openvpn
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following additional packages will be installed:
  libpkcs11-helper1
Suggested packages:
  easy-rsa resolvconf
The following NEW packages will be installed:
  libpkcs11-helper1 openvpn
0 upgraded, 2 newly installed, 0 to remove and 0 not upgraded.
Need to get 513 kB of archives.
After this operation, 1270 kB of additional disk space will be used.
Do you want to continue? [Y/n]