It looks like you're new here. If you want to get involved, click one of these buttons!
I'm relatively new to Linux so it's very possible that I've missed something fairly basic. Any help would be much appreciated. Thank you.
W: Failed to fetch http://ppa.launchpad.net/ethereum/ethereum-dev/ubuntu/dists/jessie/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/ethereum/ethereum/ubuntu/dists/jessie/main/binary-amd64/Packages 404 Not Found