Installing from the PPA is *much* easier: $ sudo add-apt-repository ppa:freecad-maintainers/freecad-stable $ sudo apt-get update $ sudo apt-get install freecad
If you really want to live at the bleeding (what means a higher chance of bugs and crashes), write "ppa:freecad-maintainers/freecad-daily" instead of "ppa:freecad-maintainers/freecad-stable".
Notice that you have to trust the guys who make the DEB packages not to include any additional proprietary software or even malware.
