Cannot update Ubuntu 12.04

[Hollyca]

When I run the update manager, and check for updates I get:
Failed to download repository information
Check your internet Connection

W:Failed to fetch http://ppa.launchpad.net/psyke83/ppa/ubuntu/dists/precise/main/source/Sources 404 Not Found
, W:Failed to fetch http://ppa.launchpad.net/psyke83/ppa/ubuntu/dists/precise/main/binary-amd64/Packages 404 Not Found
, W:Failed to fetch http://ppa.launchpad.net/psyke83/ppa/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.

[Chris Sampson (chrsamp)]

Thank you for taking the time to report this issue and helping to make Ubuntu better. Examining the information you have given us, this does not appear to be a bug report so we are closing it and converting it to a question in the support tracker. We understand the difficulties you are facing, but it is better to raise problems you are having in the support tracker at https://answers.launchpad.net/ubuntu if you are uncertain if they are bugs. You can also find a valid help posting your problem in the support forum of your local Ubuntu's community http://loco.ubuntu.com/ or asking at http://askubuntu.com. For help on reporting bugs, see https://help.ubuntu.com/community/ReportingBugs.