1. Download and install Virtualbox 4.2.12+ (This was made using 4.2.12) from their website.

2. Download and install Vagrant from www.vagrantup.com

3. Download the [http://dl.mapgears.com/ubuntugis/Vagrantfile Vagrantfile] and the[http://dl.mapgears.com/ubuntugis/bootstrap.sh boostrap.sh] script and put them in the directory where the VM will live, you'll be able to access any files in this directory from inside the VM /vagrant/. ie: ~/vm/ubuntugis/

4. In the vm folder, run
    {{{
    vagrant up
    }}}
    "{{{vagrant up}}}" will take care of installing everything you need for packaging.
    Once it's done you can access the vm with "{{{vagrant ssh}}}".

5. We need to setup the GPG key to sign the packages in the VM. 
    On the host machine create a GPG key if you haven't already then do
    {{{
    mkdir ~/vm/ubuntugis/keys
    
    gpg --export -o ~/vm/ubuntugis/keys/public_key
    gpg --export-secret-keys -o ~/vm/ubuntugis/keys/private_key
    }}}

    Then from inside the VM.
    {{{
    cd /vagrant/keys
    gpg --import public_key
    gpg --import private_key
    }}}

6. We also have to add some environment variables.
    Let's modify our ~/.bashrc
    {{{
    export DEBFULLNAME="Full Name"
    export DEBEMAIL="email@mail.com"
    export GPGKEY=YOURKEY
    export QUILT_PATCHES=debian/patches
    }}}
    You can get your GPGKEY using "{{{gpg --list-keys}}}"

7. You should also add the ubuntugis to your dput config file.
    Create and modify {{{~/.dput.cf}}}
    {{{
    [ubuntugis-unstable]
    fqdn = ppa.launchpad.net
    method = ftp
    incoming = ~ubuntugis/ubuntugis-unstable/ubuntu/
    login = jlarouche // change that!
    allow_unsigned_uploads = 0
    }}}
    This will let you upload using "{{{dput ubuntugis-unstable package_sources.changes}}}"


The environment is pretty much set now. 
I suggest using the /vagrant/packages directory (~/vm/ubuntugis/packages on the host) for your packages, that way you can edit some files from the host and only use Vagrant for the packaging/build.

The pbuilder-dist environments that were setup by the bootstrap script are SID, Lucid, Precise, Quantal and Raring each in i386 and amd64.