the universe section needs to be added as well, also having the source sections doesn't hurt, so you are able to get the relevant source packages:
deb http://archive.ubuntu.com/ubuntu lucid main universe deb-src http://archive.ubuntu.com/ubuntu lucid main universe
the universe section needs to be added as well, also having the source sections doesn't hurt, so you are able to get the relevant source packages:
deb http:// archive. ubuntu. com/ubuntu lucid main universe archive. ubuntu. com/ubuntu lucid main universe
deb-src http://