Adding old repo to Ubuntu to fix 404 error

Adding old  repo to Ubuntu

we need to remove   the existing  repos and add this old one

 nano /etc/apt/sources.list  and  add this repo after remove  the existing ones

deb http://old-releases.ubuntu.com/ubuntu saucy main
deb http://old-releases.ubuntu.com/ubuntu saucy-updates main
deb http://old-releases.ubuntu.com/ubuntu saucy-security main universe
deb http://old-releases.ubuntu.com/ubuntu saucy universe
deb http://old-releases.ubuntu.com/ubuntu saucy-updates universe