How to rebuild packages with source files in debian/ubuntu

1. download the debian/ubuntu package file (xxxx.dsc, xxxx.orig.tar.gz, and xxxx.diff.gz) from
   ubuntu’s package page or debian’s package page
2. # dpkg-source -x xxx.dsc // to extract package source file
3. # debuild -rfakeroot // (optional) to build source files with a fake root
4. # dpkg -i xxx.deb // install package binary file

Reference:
http://www.debian.org.hk/planet?page=2