Cisco VPN client on Ubuntu 16.04 LTS
I was using the Cisco AnyConnect Client for Linux during the last months, which was in general working, but had a few major bugs. Most important: whenever you disconnected (also by just switching to another network), you would have to completely restart the computer to make the VPN work again.
I now switched to the open source client called OpenConnect, which is compatible with Cisco's AnyConnect SSL VPN but just works a lot more reliable. To install and enable the VPN, have a look at this: https://people.eng.unimelb.edu.au/lucasjb/oc.html
Edit: just saw that OpenConnect was already proposed in a comment. Leave this answer here as it provides some additional information and a step-by-step manual
OpenConnect offers an opensource command line alternative to Cisco's GUI:
echo "password" | sudo openconnect server --user=username --passwd-on-stdin
See here for more details/source I blatantly stole this answer from: https://askubuntu.com/questions/1043024/how-to-run-openconnect-with-username-and-password-in-a-line-in-the-terminal
Install info here: http://ubuntuhandbook.org/index.php/2014/11/connect-cisco-anyconnect-vpn-ubuntu/
- First run command below to active the TUN module (I didn't need this in Ubuntu 18.04.3 LTS):
sudo /sbin/modprobe tun
- Install OpenConnect:
sudo apt-get install openconnect
- Run command above or:
sudo openconnect SERVERADDR
Run
sudo apt-get install network-manager-vpnc network-manager-vpnc-gnome
Then open network manager and add a new VPN, it should show Cisco Compatible VPN in your list now.