[wellylug] apt sources list problem

[Glenn Stuart Morrissey]

When I run:
sudo apt-get update

Part of the output is:

glenn at acer:~$sudo apt-get update
...
Err http://ppa.launchpad.net precise/main Sources                                 
  404  Not Found
Err http://ppa.launchpad.net precise/main i386 Packages
  404  Not Found
...
W: Failed to fetch http://ppa.launchpad.net/emesene-team/emesene-stable/ubuntu/dists/precise/main/source/Sources  404  Not Found
W: Failed to fetch http://ppa.launchpad.net/emesene-team/emesene-stable/ubuntu/dists/precise/main/binary-i386/Packages  404  Not Found
E: Some index files failed to download. They have been ignored, or old ones used instead.
glenn at acer:~$

I cant find any trace of ppa.launchpad.net in my sources.list, sources.list~ or sources.list.save files. 
Here is the contents of my /etc/apt directory:

glenn at acer:/etc/apt$ ls
apt.conf.d     sources.list   sources.list.d     trustdb.gpg  trusted.gpg~
preferences.d  sources.list~  sources.list.save  trusted.gpg  trusted.gpg.d
glenn at acer:/etc/apt$

How do I remove the launchpad references If I cant find reference to them?

Glenn.
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