[firedrake] Problems with spud- Firedrake-fluids

Dear all, I am trying to install the Firedrake-Fluids module. First of all, I installed Spud, but I have some problems with the source code. Since I work on Ubuntu, I tried to install the dependencies adding the Launchpad repository but, when I update and type *sudo apt-get build-dep spud* I receive the error *unable to find a source package for spud* I tried to build it and install from source via bzr repository an it seems to work, but when I try to make the Firedrake-Fluids tests, I have *No module named libspud* Can anybody help me with this problem? Many thanks, Sara