LinearSolver is not defined in 2018.1

9 days ago by
    I used to use LinearSolver and most of my codes contain it. After I upgraded to 2018.1, it's said that
    NameError: name 'LinearSolver' is not defined.

   However, I read the source in GitHub, and the file LinearSolver.cpp is included. I also read the changelog, and there are no words
about LinearSolver. So what happened and how to solve it?
  The version of python is 3.6.5 and the operating system is Ubuntu 18.
  Thanks a lot.
  BTW, I do know that solver_parameters can do the same thing.
Community: FEniCS Project
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