I've modifed code for gnome-panel(ubuntu 7.1) and build it and tested it. It is working as per my requirements. Now I need to give this change as patch or new deb package for gnome-panel. From development machine how can I create patch/package for the same.
Plz advise.

Does it contain a directory
debian/patches
?

I just downloaded source package using apt-get and unzipped the package in /home/test/gnome-panel-2.20.1. I then modified code in /home/test/gnome-panel-2.20.1/gnome-panel/ folder and build the code and installed the code. Now I need to create binary patch or binary package for gnome-panel so that I can install this on other machines.

Plz advise.

Hum I thought you wanted a source patch. And that's why I asked if the original already contained a debian/patches, you would just have to
-generate your .patch file (diff -Nru between orig and yours)
-use dpatch and put it in the patches directory and register it in 00list
-build source package / binary

In your case, you can build a new binary package, taking care that you increase the version number.

- change changelog manually or better use dch -nmu
- build package using debuild or pbuilder


More info:
https://help.ubuntu.com/6.10/ubuntu/packagingguide/
http://www.debian.org/doc/maint-guid...html#s-debuild
http://www.debian.org/doc/maint-guid...tml#s-pbuilder
http://www.debian.org/doc/maint-guid....html#contents

Actually I do it the old manual way, but you shouldn't do this, from what the tutorials said. I have something like 40 or 50 packages of my own.
- modify changelog manually
- build using debian/rules

You could also look at debdiff but I've never used it and I don't see the point of having a deb diff rather than a full binary package.. unless you have huge bandwidth limitations.

This is the general idea, from memory. Tell us if it fails / succeeds eventually