Install libapache2-mod-nss by entering the following commands in the terminal:
sudo apt update sudo apt install libapache2-mod-nss
Description:
NSS-based SSL module for Apache2
This Apache module provides strong cryptography for the Apache 2.0 webserver via the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols by the help of the SSL/TLS implementation library NSS . This module is based heavily on the mod_ssl package. In fact, it's more a conversion than anything else.
Homepage: http://fedorahosted.org/mod_nss
Version: 1.0.14-1build1
Section: universe/web