Ipopt installation in Linux - problems

[Mauricio Moreno Zambrano]

Hi everyone. Again

I have been trying to install ipopt in Ubuntu 14.04.5 (GNU/Linux 3.13.0-65-generic x86_64).

After had followed the instruction of the Coin project, I am getting the next error message

WARNING: "[base]/dist-packages/pyomo/opt/base/solvers.py", 201, __solver_call__

        Failed to create solver with name 'ipopt':

        Failed to set executable for solver asl. File with name=/opt/CoinIpopt/build/lib/pkgconfig either does not exist or it is not executable. To skip this validation, call set_executable with validate=False.

Traceback (most recent call last):

  File "camu_v0.8_vanilla.py", line 158, in <module>

    results = solver.solve(instance,tee=True,file_determinism=1)

  File "/usr/local/lib/python2.7/dist-packages/pyomo/opt/base/solvers.py", line 126, in solve

    self._solver_error('solve')

  File "/usr/local/lib/python2.7/dist-packages/pyomo/opt/base/solvers.py", line 154, in _solver_error

    + "\n\toptions: %s" % ( self.options, ) )

RuntimeError: Attempting to use an unavailable solver.

The SolverFactory was unable to create the solver "ipopt"

and returned an UnknownSolver object.  This error is raised at the point

where the UnknownSolver object was used as if it were valid (by calling

method "solve").

The original solver was created with the following parameters:

        executable: /opt/CoinIpopt/build/lib/pkgconfig

        type: ipopt

        _args: ()

        options: {}

I have tried by specifying directly the path where my 'ipopt.pc' executable is located, as Gabe suggested in an older post and I had also added this location into my path in the .bashrc file. Both options hadn't worked.

I hope that someone else that had passed by something similar could give advice,

Thanks in advance

Mauricio 

[Gabriel Hackebeil]

Mauricio,

I’ve never encountered a case where this error wasn’t due to a problem with the PATH setup. If you are on linux and your PATH is set up correctly, then you should be able to type ‘ipopt’ inside the terminal from any directory and see output like:

$ ipopt
No stub!
usage: ipopt [options] stub [-AMPL] [<assignment> ...]

Options:
--  {end of options}
-=  {show name= possibilities}
-?  {show usage}
-bf {read boundsfile f}
-e  {suppress echoing of assignments}
-of {write .sol file to file f}
-s  {write .sol file (without -AMPL)}
-v  {just show version}

Can you verify that this works?

Also, note that it is not the location of “ipopt.pc” that you need to add to your path, but rather, the location of “ipopt” (which is usually inside of a directory named “bin”).

Gabe

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