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apt-get update && apt-get upgrade -y
apt-get install squid3

cp -v /etc/squid/squid.conf{,.factory}

Firewall

See notes under: Firewall

ufw status
ufw allow squid
ufw reload
ufw status

  400  apt-get install apache2-utils
  401  sudo touch /etc/squid/passwd
  402  sudo chown proxy: /etc/squid/passwd
  403  ls -l /etc/squid/passwd
  405  htpasswd /etc/squid/passwd david

View the existing squid conf (with comments/documentation cut out)

cat /etc/squid/squid.conf | grep -v -e '^\#' -e '^$'

sed -i 's,http_access deny all,http_access allow all,g' /etc/squid/squid.conf

sed -i 's,http_access allow all,http_access deny all,g' /etc/squid/squid.conf

sudo squid -k shutdown