Can't upgrade from Ubuntu 14.04 to 16.04
So I'm trying to upgrade my server from Ubuntu 14.04 to 16.04 and it fails.
sudo apt-get update sudo apt-get upgrade sudo apt-get dist-upgrade
It starts going and then stops because it failed to fetch some packages:
W:Failed to fetch http://ppa.launchpad.net/fkrull/deadsnakes-python2.7/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/fkrull/deadsnakes-python2.7/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/rwky/redis/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found , W:Failed to fetch http://ppa.launchpad.net/rwky/redis/ubuntu/dists/xenial/main/binary-i386/Packages 404 Not Found , E:Some index files failed to download. They have been ignored, or old ones used instead.