Updating from Freya to wily is quite annoying at this point. I'm somewhat a newbie to Linux, but when I run update commands in terminal or software update I get the following:
W:Failed to fetch_http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/trusty/main/binary-amd64/Packages/dists/trusty/main/source/Sources 404 Not Found
,
W:Failed to fetch_http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/trusty/main/binary-amd64/Packages/dists/trusty/main/binary-amd64/Packages 404 Not Found
,
W:Failed to fetch_http://ppa.launchpad.net/elementary-os/stable/ubuntu/dists/trusty/main/binary-amd64/Packages/dists/trusty/main/binary-i386/Packages 404 Not Found
,
W:Failed to fetch_http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu/dists/trusty/main/source/Sources 404 Not Found
,
W:Failed to fetch_http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu/dists/trusty/main/binary-amd64/Packages 404 Not Found
,
W:Failed to fetch_http://ppa.launchpad.net/gwibber-daily/ppa/ubuntu/dists/trusty/main/binary-i386/Packages 404 Not Found
,
E:Some index files failed to download. They have been ignored, or old ones used instead.