I think that this is how I got Extended running on 15.04:
This is not guaranteed though.
Message: 5 Date: Sat, 15 Aug 2015 14:10:40 -0700 From: Forrest Curo treegestalt@gmail.com To: pd-list pd-list@lists.iem.at Subject: Re: [PD] [PD-announce] announcing Context, a modular > sequencer for PD Message-ID: CAAn-EcySmx+e_fe8pukNeof2-s9eCMnQW5OtVwvR9H36eY_wRg@mail.gmail.com Content-Type: text/plain; charset="utf-8"
for me (on ubuntu 15.04) fails at update: Fetched 1,157 kB in 1min 14s (15.5 kB/s)
W: Failed to fetch http://apt.puredata.info/releases/dists/vivid/main/binary-amd64/Packages 404 Not Found
W: Failed to fetch http://apt.puredata.info/releases/dists/vivid/main/binary-i386/Packages 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/eighthave/pd-extended/ubuntu/dists/vivid/main/binar... 404 Not Found
W: Failed to fetch http://ppa.launchpad.net/eighthave/pd-extended/ubuntu/dists/vivid/main/binar... 404 Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
and so, still 'failed to locate package.'
Zexy is no doubt here somewhere, but to get iemguts?