Create deb file of packages installed in your system

You can create .deb file of any installed package on your system.

For this you will need the package dpkg-repack.

So install this package by:

apt-get install dpkg-repack 

Now run by typing dpkg-repack at terminal

To generate a .deb file of rhythmbox, type this at terminal:

sudo  dpkg-repack rhythmbox

This will create a .deb file in the directory where you are running the command.