Hi Magali,
Running into blas/lapack errors during the Trilinos installation is unfortunately not uncommon. It can either be something related to the specific blas/lapack library versions, or Trilinos not locating all the right libraries.
One relatively easy solution and generally robust solution for this is to install openblas with candi. To do this, you should just need to modify the following line to include openblas:
PACKAGES="load:dealii-prepare once:cmake once:astyle once:hdf5 once:sundials once:p4est once:trilinos once:openblas dealii"
Hopefully this does the trick!
Cheers,
John