Install libpam-modules by entering the following commands in the terminal:
sudo apt update sudo apt install libpam-modules
Description:
Pluggable Authentication Modules for PAM
This package completes the set of modules for PAM. It includes the pam_unix.so module as well as some specialty modules.
Homepage: http://www.linux-pam.org/
Version: 1.1.8-3.6ubuntu2
Section: admin