How to generate Debian packages
cd [GTSAM_SOURCE_ROOT]
bash package_scripts/prepare_debian.sh
How to generate Ubuntu packages for a PPA
cd [GTSAM_SOURCE_ROOT]
bash package_scripts/prepare_ubuntu_pkgs_for_ppa.sh
cd ~/gtsam_ubuntu
bash [GTSAM_SOURCE_ROOT]/upload_all_gtsam_ppa.sh