Finding a package name, when you know a file name :
'dpkg -S /usr/bin/gprof'
.. The reply is : binutils
Google : .. binutils Ubuntu ..
http://packages.ubuntu.com/karmic/binutils
[ hardy ] [ intrepid ] [ jaunty ] [ karmic ]
.. Choose an Ubuntu version ..
> > Links for binutils >
> Download Source Package binutils:
> e.g. [binutils_2.20.orig.tar.gz]
.....