java not updating (apt-get update)

I try to update my packages and get the following error (12.04 lts, 3.2 kernel)

...Ign http://linux.dropbox.com precise/main Translation-en
Hit http://www.geekconnection.org karmic/ Packages
Ign http://www.geekconnection.org karmic/ Translation-en_GB
Ign http://www.geekconnection.org karmic/ Translation-en
Fetched 2,813 B in 3s (806 B/s)
W: Failed to fetch http://ppa.launchpad.net/ferramroberto/java/ubuntu/dists/precise/main/source/Sources 404 Not Found

W: Failed to fetch http://ppa.launchpad.net/ferramroberto/java/ubuntu/dists/precise/main/binary-i386/Packages 404 Not Found

E: Some index files failed to download. They have been ignored, or old ones used instead.

I am quite new to this--do i just uncheck the failing packages from the software list or point the apt-get towards another mirror or something???

I do have an internet connection so that isnt a problem. I understand that it cant update because the server is down- is that correct or have i messed some setting up that is preventing the update. Firewall is on but it only rejects connections on port 22.

Thanks