Install ruby-omniauth-cas3 by entering the following commands in the terminal:
sudo apt update sudo apt install ruby-omniauth-cas3
Description:
CAS 3.0 Strategy for OmniAuth
This is a OmniAuth 1.0 compatible port of the previously available [OmniAuth CAS strategy][old_omniauth_cas] that was bundled with OmniAuth 0.3. This strategy has also been updated for CAS protocol version 3.0 and patched to deal with namespace issues.
Homepage: https://github.com/tduehr/omniauth-cas3
Version: 1.1.4-1
Section: universe/ruby