To disable the Squid proxy server on a Linux system, you can use the systemctl command to stop and disable the squid service.
First, stop the squid service:
systemctl stop squid
Next, disable the squid service so that it does not start automatically at boot:
systemctl disable squid
Alternatively, you can use the service command, which is deprecated but still commonly used:
service squid stop chkconfig squid off
If you are using a version of Linux that does not use systemd, you can use the /etc/init.d/squid script to stop and disable the squid service:
/etc/init.d/squid stop chkconfig squid off
It's always a good idea to carefully review the documentation and use the appropriate commands to stop and disable the squid service. This will help ensure that the proxy server is not running and is not interfering with your network configuration.