Install libapache2-mod-auth-gssapi by entering the following commands in the terminal:
sudo apt update sudo apt install libapache2-mod-auth-gssapi
Description:
GSSAPI Authentication module for Apache2
The mod_auth_gssapi module is an authentication service that implements the SPNEGO based HTTP Authentication protocol defined in RFC4559.
Homepage: https://github.com/modauthgssapi/mod_auth_gssapi
Version: 1.6.0-1build1
Section: universe/web