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Ubuntu update error "404 Not Found [IP: 80]"

A couple days ago, I's trying to upgrade my Ubuntu 12.10 server and got this annoying error:

$ sudo apt-get update

404  Not Found [IP: 80]

What's up man?

It turned out that Ubuntu 12.10 reached its End-Of-Life (totally forgot) and its repositories were moved to another server. So, all I have to do is change the and package repository URLs to

$ sudo sed -i -e 's/\|' /etc/apt/sources.list

Update again and enjoy:

$ sudo apt-get update