I don't think it is possible for trilinos to depend on both versions.
Of course it should not. But it does. $ apt-cache show libtrilinos-amesos-dev Package: libtrilinos-amesos-dev Source: trilinos Version: 12.10.1-3 .. Depends: libmumps-dev, libtrilinos-amesos12 (= 12.10.1-3), trilinos-dev $ apt-cache show libmumps-dev Package: libmumps-dev Source: mumps Version: 5.1.1-2 .. Depends: libmumps-5.1.1 (= 5.1.1-2), libscalapack-mpi-dev, mpi-default-dev $ apt-cache show libtrilinos-amesos12 Package: libtrilinos-amesos12 Source: trilinos Version: 12.10.1-3 .. Depends: libc6 (>= 2.14), libgcc1 (>= 1:3.0), libmumps-4.10.0, libopenmpi2, libstdc++6 (>= 5.2), libtrilinos-epetra12, libtrilinos-epetraext12, libtrilinos-teuchos12
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