Upgrading from Ubuntu 12.10 to 14.04

It seems that a few of my instances in AWS were originally set up using Ubuntu 12.10. I don't know how that happened, but anyway, now that 12.10 is no longer supported, you can't just upgrade.

So the solution is to use the old.releases.ubuntu.com site and update/upgrade from there.

sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak 
sudo sed -i -re 's/us-west-2.ec2.archive.ubuntu.com|security.ubuntu.com/old-releases.ubuntu.com/g' /etc/apt/sources.list 
sudo apt-get update && sudo apt-get dist-upgrade 
sudo do-release-upgrade

This got me to 13.10, then another do-release-upgrade got me to 14.04.5.