ref: http://www.debian.org/doc/manuals/apt-howto/ch-sourcehandling.en.html $apt-get source ibus-chewing charles-chang@ubuntu:~/Downloads$ apt-get source ibus-chewing Reading package lists... Done Building dependency tree Reading state information... Done NOTICE: 'ibus-chewing' packaging is maintained in the 'Bzr' version control system at: lp:~pkg-ime/ibus/debian-ibus-chewing Please use: bzr get lp:~pkg-ime/ibus/debian-ibus-chewing to retrieve the latest (possibly unreleased) updates to the package. Need to get 85.5kB of source archives. Get:1 http://us.archive.ubuntu.com/ubuntu/ maverick/main ibus-chewing 1.3.6.20100730-1 (dsc) [1,480B] Get:2 http://us.archive.ubuntu.com/ubuntu/ maverick/main ibus-chewing 1.3.6.20100730-1 (tar) [80.7kB] Get:3 http://us.archive.ubuntu.com/ubuntu/ maverick/main ibus-chewing 1.3.6.20100730-1 (diff) [3,316B] Fetched 85.5kB in 3s (25.1kB/s) sh: dpkg-source: not found Unpack command 'dpkg-source -x ibus-chewing_1.3.6.20100730-1.dsc' failed. Check if the 'dpkg-dev' package is installed. E: Child process failed then install dpkg-dev then install build-dep for ibus-chewing