sudo apt-get update

W: Failed to fetch httpe://archive.ubuntu.com/ubuntu/dists/raring/main/binary-amd64/Packages  Protocol httpe not supported or disabled in libcurl
W: Failed to fetch httpe://archive.ubuntu.com/ubuntu/dists/raring/multiverse/binary-i386/Packages  Protocol httpe not supported or disabled in libcurl
E: Some index files failed to download. They have been ignored, or old ones used instead.

sudo sed -i 's/httpe:/http:/g' /etc/apt/sources.list
sudo apt-get update

sudo sed -i -re 's/([a-z]{2}.)?archive.ubuntu.com|security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list
sudo apt-get update