Amazon EC2 Ubuntu Instance package installation problems

Amazon EC2 Ubuntu Instance package installation problems

I have an amazon EC2 installation of Ubuntu Precise 12.04, 64Bit
(ami-ce7b6fba)
I just don't seem to be able to install anything as you would normally
expect. When I run 'sudo apt-get update' I get the following issues;
W: GPG error: http://www.ubnt.com ubuntu Release: The following signatures
couldn't be verified because the public key is not available: NO_PUBKEY
06E85760C0A52C50
W: Failed to fetch
http://ppa.launchpad.net/andphe/php/ubuntu/dists/precise/main/source/Sources
404 Not Found
W: Failed to fetch
http://ppa.launchpad.net/andphe/php/ubuntu/dists/precise/main/binary-amd64/Packages
404 Not Found
W: Failed to fetch
http://ppa.launchpad.net/andphe/php/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.
Can anyone assist me in getting this fixed?
Thank you so much in advance
Stu