How can I install CyberGhost VPN on Ubuntu?

To install CyberGhost VPN on Ubuntu, one needs to first ensure they have a subscription with CyberGhost. Following this, it's important to open a terminal window. In the terminal, one must use the command `sudo apt-get update` to update the package lists. Next, they should install the OpenVPN package by typing `sudo apt-get install openvpn`. After that, they need to download the configuration files from the CyberGhost website. With the configuration file ready, it's time to unzip it using the `unzip` command if not already installed (install it via `sudo apt-get install unzip`). Once unzipped, navigate into the directory containing the configurations and connect to the VPN using 'sudo openvpn --config /path/to/downloaded/config/file.ovpn'. A prompt will ask for CyberGhost account credentials; entering them will establish a connection to the CyberGhost VPN service. It's advisable to also set up proper DNS leak protection and verify that the VPN is functioning as intended.