This question already has an answer here:
running Ubuntu 15.10 When I try to apt-get update/upgrade, I get the following error
W: Failed to fetch http://ppa.launchpad.net/banshee-team/ppa/ubuntu/dists/wily/main/binary-amd64/Packages 404 Not Found W: Failed to fetch http://ppa.launchpad.net/banshee-team/ppa/ubuntu/dists/wily/main/binary-i386/Packages 404 Not Found
as well as the same for colingille/freshlight/ etc (can't post more than two links)
I'm not sure why, any ideas as to why this is happening?