The Ubuntu development community has created a convenient package that installs everything you need to get started. Install
packaging-dev from the Ubuntu software repositories, which includes
gnupg, the GNU Privacy Guard, which includes the cryptographic tools you need to sign your packages when you upload them to Launchpad
pbuilder, which creates reproducible builds of a package in a clean, isolated environment
bzr-builddeb, which includes
bzr; together these serve as your version control and package management ...