I am a beginner user of Ubuntu 18.04.
And I want to use a proxy server on my laptop. So I just tried to find a way of using a proxy server to connect to the internet and followed the instructions mentioned at the website.
I have no idea what is wrong. At terminal, it always says something like this
E :Syntax error/etc/apt/apt.conf:3: Extra junk at the end of file
whatever I type. So I want to know how to fix it or how to remove it. Help me please.