$ sudo apt install apt-transport-https
$ wget https://swupdate.openvpn.net/repos/openvpn-repo-pkg-key.pub
$ sudo apt-key add openvpn-repo-pkg-key.pub
$ sudo apt-key add openvpn-repo-pkg-key.pub
$ rm openvpn-repo-pkg-key.pub
#check your distribution
$ lsb_release -a
# bionic part should be replaced by your release code.
$ sudo wget -O /etc/apt/sources.list.d/openvpn3.list https://swupdate.openvpn.net/community/openvpn3/repos/openvpn3-bionic.list
$ sudo apt update
$ sudo apt install openvpn3

 How to use and connect vpn

$ openvpn3 config-import --config vpngate_219.100.37.144_tcp_443.ovpn
$ openvpn3 configs-list
Configuration path
Imported                        Last used                 Used
Name                                                      Owner
------------------------------------------------------------------------------
/net/openvpn/v3/configuration/0e0f4e85x09f6x4fb4x9316x2b1db0b7f7bc
Thu Feb 11 14:10:22 2021        Thu Feb 11 18:53:53 2021  2
vpngate_138.64.66.19_udp_62478.ovpn                       doctor

/net/openvpn/v3/configuration/2bd1a349xcf1ax4722xb770x99af0ee10a84
Thu Feb 11 20:14:05 2021        Thu Feb 11 20:14:48 2021  1
vpngate_219.100.37.144_tcp_443.ovpn                       doctor

/net/openvpn/v3/configuration/6a7a57d1xaec4x48b2xadecx94e0ba0d2423
Sun Feb 14 12:18:21 2021                                  0
vpngate_219.100.37.144_tcp_443.ovpn                       doctor
------------------------------------------------------------------------------

$ openvpn3 session-start --config-path /net/openvpn/v3/configuration/0e0f4e85x09f6x4fb4x9316x2b1db0b7f7bc