I get the error below:
W: Failed to fetch
http://ppa.launchpad.net/ethereum/ethereum/ubuntu/dists/jessie/main/binary-amd64/Packages 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
==> Installing eth
$ sudo apt-get install -q -y eth
Reading package lists...
Building dependency tree...
Reading state information...
E: Unable to locate package eth
==> Verifying installation
✘ Eth is missing
==> Installation failed
Comments
https://aur.archlinux.org/packages/ethereum/
Edit: I suggest you use it instead of Ubuntu.