Trouble-shooting for apt-get install

Sometimes, when we work in the company, we usually have a proxy, which help us connect to outside network.

Today I met the issue when I try to install apt-get package because I forgot to change my proxy in the file.

Then I found how to fix it.

sudo vim /etc/apt/apt.conf

you will edit the file and change the proxy in your company!

Moreover, it is better to change the proxy in the setting in system

sudo vim  ~/.bashrc
http_proxy=<proxy IP>