It is recommended to use the Cisco Anyconnect VPN client.
Optionally an Open Source solution can be used.

Installing network-manager-openconnect

sudo apt install openconnect network-manager-openconnect network-manager-openconnect-gnome python3-pip python3-pyqt5 python3-pyqt5.qtwebengine
pip install --user openconnect-sso
export PATH=$PATH:/home/$USER/.local/bin
echo "export PATH=\$PATH:/home/$USER/.local/bin" >> .bash_profile

Configuration

Open network settings and click on the plus symbol at the bottom left hand side.
Choose VPN and then select Cisco AnyConnect Compatible VPN (openconnect).
Give the connection a name and fill in vpn.ugent.be as gateway.

Optional

In the network manager, click on the VPN connection and then on the settings icon on the bottom right hand side.
Click IPV4 and fill in the following for Routes:

Address: 157.193.0.0
Netmask: 255.255.0.0
Gateway 0.0.0.0

Enable "Use this connection only for resources on its network".

Restart the network services:

sudo service networking restart
sudo service network-manager restart

OpenConnect SSO wrapper

• Version v0.6.1 or higher is needed
• The most recent version can be found at https://github.com/vlaci/openconnect-sso

The VPN connection can then be made using the command line:

openconnect-sso --server vpn.ugent.be

• If you've installed a firewall, you need to configure it correctly in order to have the VPN connections pass through.