/usr/include/dolfin/la/ is in libdolfin-dev 2017.2.0.post0-2.
This file is owned by root:root, with mode 0o755.
..
/usr/include/dolfin/la/Amesos2LUSolver.h
/usr/include/dolfin/la/BelosKrylovSolver.h
/usr/include/dolfin/la/BlockMatrix.h
/usr/include/dolfin/la/BlockVector.h
/usr/include/dolfin/la/CoordinateMatrix.h
/usr/include/dolfin/la/DefaultFactory.h
/usr/include/dolfin/la/EigenFactory.h
/usr/include/dolfin/la/EigenKrylovSolver.h
/usr/include/dolfin/la/EigenLUSolver.h
/usr/include/dolfin/la/EigenMatrix.h
/usr/include/dolfin/la/EigenVector.h
/usr/include/dolfin/la/GenericLinearAlgebraFactory.h
/usr/include/dolfin/la/GenericLinearOperator.h
/usr/include/dolfin/la/GenericLinearSolver.h
/usr/include/dolfin/la/GenericMatrix.h
/usr/include/dolfin/la/GenericTensor.h
/usr/include/dolfin/la/GenericVector.h
/usr/include/dolfin/la/Ifpack2Preconditioner.h
/usr/include/dolfin/la/IndexMap.h
/usr/include/dolfin/la/KrylovSolver.h
/usr/include/dolfin/la/LUSolver.h
/usr/include/dolfin/la/LinearAlgebraObject.h
/usr/include/dolfin/la/LinearOperator.h
/usr/include/dolfin/la/LinearSolver.h
/usr/include/dolfin/la/Matrix.h
/usr/include/dolfin/la/MueluPreconditioner.h
/usr/include/dolfin/la/PETScBaseMatrix.h
/usr/include/dolfin/la/PETScFactory.h
/usr/include/dolfin/la/PETScKrylovSolver.h
/usr/include/dolfin/la/PETScLUSolver.h
/usr/include/dolfin/la/PETScLinearOperator.h
/usr/include/dolfin/la/PETScMatrix.h
/usr/include/dolfin/la/PETScObject.h
/usr/include/dolfin/la/PETScOptions.h
/usr/include/dolfin/la/PETScPreconditioner.h
/usr/include/dolfin/la/PETScVector.h
/usr/include/dolfin/la/SLEPcEigenSolver.h
/usr/include/dolfin/la/Scalar.h
/usr/include/dolfin/la/SparsityPattern.h
/usr/include/dolfin/la/TensorLayout.h
/usr/include/dolfin/la/TpetraFactory.h
/usr/include/dolfin/la/TpetraMatrix.h
/usr/include/dolfin/la/TpetraVector.h
/usr/include/dolfin/la/TrilinosParameters.h
/usr/include/dolfin/la/TrilinosPreconditioner.h
/usr/include/dolfin/la/Vector.h
/usr/include/dolfin/la/VectorSpaceBasis.h
/usr/include/dolfin/la/dolfin_la.h
/usr/include/dolfin/la/solve.h
/usr/include/dolfin/la/test_nullspace.h