How to set up proxy auto config on Ubuntu Desktop

Suppose you are using your Ubuntu Desktop laptop at home and workplace. Assume that when you are at your workplace, the corporate network your laptop is connected to is behind proxy. You then have to turn on/off proxy depending on where you are. Of course you can manually update proxy settings of Ubuntu Desktop every time your network changes, but that's quite cumbersome. That's when proxy auto-config helps.Read more »