Follow these instructions to change to our DNS servers in Ubuntu
The first thing you need to do to connect to our VPN-tunnel is to open system settings. 
Once you open System settings, click Programs & updates.
Make sure universe is activated. 
If you receive a message about a software update, please approve it.
If you receive a message asking for authentication, please enter you passwords.
All the hardware used to operate OVPN is owned by us. All VPN servers operate without hard drives as the operating system only resides in RAM.
Learn moreYou can open a new CLI by pressing Ctrl + Alt + t at the same time, or by searching after a CLI.
Enter the following command to install needed components:
sudo apt-get -y install network-manager-openvpn
Restart the network-manager by typing:
sudo service network-manager restart
Double-click the file to extract the content.
Click the network icon in the upper right corner of the activity field and choose VPN-connections → Configure VPN. 
Click Add 
Choose Import a saved VPN configuration... 
Open the folder where you isntalled the configuration files, and choose ovpn.conf 
Enter the username and password you used when creating your OVPN account. 
Go to tab Settings for IPv4, and choose Only automatic (VPN) addresses. 
You can make the same settings for IPv6 if you are using that.
Go back to VPN-tab and click Advanced. In the new window that opens, go to the tab named TLS-authentification.
Choose Use another TLS-authentication, and choose the file ovpn-tls.key. 
The last step is to enter the Key direction to 1. 
Save all the configurations you have made by clicking OK, and then Save.
Click the network icon in the upper right corner of the activity field and choose VPN-connections → ovpn. 
If the connection is successful you will see:
You should now be connected to OVPN and be able to browse the internet safely. To make sure everything was set up correctly, please check the dashboard to verify that you are connected.