pbuilder constructs a chroot system, and builds a package inside the
chroot. It uses apt extensively, and a local mirror, or a fast
connection to a Debian/Ubuntu mirror is ideal, but not necessary.

"pbuilder create" uses debootstrap to create a chroot image.

"pbuilder update" updates the image to the current state of
testing/unstable/whatever

"pbuilder build" takes a *.dsc file and builds a binary in the chroot
image.

pdebuild is a wrapper for developers, to allow running pbuilder
just like "debuild", as a normal user.

Authors:
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Junichi Uekawa