Simple Using SQUID proxy server for Ubuntu 20.04

sudo apt install squid

sudo cp /etc/squid/squid.conf /etc/squid/squid.conf.original
sudo chmod a-w /etc/squid/squid.conf.original

sudo nano /etc/squid/squid.conf
 

inside squid.conf
http_port XXXXX
http_access allow all

sudo update-rc.d squid disable
sudo systemctl restart squid.service
sudo systemctl status squid
sudo systemctl disable squid
sudo systemctl stop squid