1.
sudo cp /etc/apt/sources.list /etc/apt/sources.list.`date +"%Y-%m-%d_%H-%M-%S"`
sudo vim /etc/apt/sources.list
sources.rar
2.sudo apt-get update
3.sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys < add keys here >
4.sudo apt-get update
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