ubuntu openvpn from windows

On windows side – the connection files are at:
C:\Program Files\OpenVPN\config
There may be files .p12 .key .ovpn
Copy them to a local folder.

On ubuntu side:
sudo apt-get install openvpn  
sudo apt-get install network-manager-openvpn  
sudo apt-get install network-manager-openvpn-gnome 
Right-click network manager, add OpenVPN connection, import .ovpn file ; then connect via network manager / VPN connections.