Install network-manager-openconnect with the following command in the terminal:

sudo apt-get install network-manager-openconnect
Download the latest Cisco AnyConnect software:
https://tu-dresden.de/zih/dienste/service-katalog/arbeitsumgebung/zugang_datennetz/vpn/ssl_vpn
In the terminal, navigate to the folder where the file is located, use the cd command.

Navigate to the correct directory
Unpack the file using the following command:

tar xvf filename

Unpacking the file
Navigate to the unzipped folder with cd filename.

Navigate to the unzipped folder
Navigate with cd vpn into the VPN folder.

Navigation into the VPN folder
Execute the following command and enter the password if necessary.

sudo ./vpn_insta ll.sh

Installing Cisco Anyconnect
You will be asked to accept the terms of use, just enter y and confirm. You should receive a success message afterwards.

Accepting the terms of use
Open Cisco AnyConnect from your programs.

Starting Cisco Anyconnect
For Connect to, enter: vpn2.zih.tu-dresden.de and confirm by clicking Connect.

Enter server address
Enter your ZIH login in the form zihlogin@tu-dresden.de and enter your password.

Enter access data
You will receive a message that the connection has been successfully established.

Successful connection establishment
To disconnect, you have to click Disconnect on Cisco AnyConnect.

Disconnect from VPN