sudo vim /etc/apt/apt.conf.d/80proxy

Acquire::http::proxy "http://10.10.1.20:8080/";
Acquire::https::proxy "http://10.10.1.20:8080/";
# Acquire::ftp::proxy "ftp://10.10.1.20:8080/";

1. Generate Certificates

1.1 Preparation

Install Easy-RSA for generating certificates: Link

1.2 Generate Server and Client Certificates

• Initialize the PKI environment: