apt-get not working

["muthuraman.s" <Mutthuramans@gmail.com>]

Hi ll,
I use Ubuntu 7.04 and when I try to install K7(thinking to increase
the speed)  kernel for the PC with apt-get, I get the following
error.not only for K7 it says the same message except for the package
name( last word in the message). I do not know what is wrong .

Reading package lists... Done
Building dependency tree
Reading state information... Done
E: Couldn't find package linux-k7

I could find a Ubuntu group but with low activity , so I am posting
this  in Debian group.

Thanks.
Muthu.