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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.

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    Please add contents of this file by posting output of cat /etc/apt/apt.conf to the question. – N0rbert Oct 20 '19 at 7:50

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