Running python code from Matlab program on Ubuntu

I try to use system(my_trigger_str) function in matlab in order to run my python program on Ubuntu (16.04).

While when I run my_trigger_str from the terminal it runs well, when I run it using system() in matlab it does not succeed import any package I use in my python code. For example, I import matplotlib in line 3 in my python program, and I receive this error. It happens for any package I try to import. From the terminal in runs well.

Any idea?

    Traceback (most recent call last):
    File "/home/kent/Desktop/SegUtilities/eval_model_PR.py", line 3, in <module>
    import matplotlib.pyplot as plt
    File "/usr/lib/python3/dist-packages/matplotlib/pyplot.py", line 36, in <module>
    from matplotlib.figure import Figure, figaspect
    File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 35, in <module>
    from matplotlib import _image
    ImportError: /usr/local/MATLAB/R2017a/sys/os/glnxa64/libstdc++.so.6: version

    `GLIBCXX_3.4.21' not found (required by /usr/lib/python3/dist-packages/matplotlib/_image.cpython-35m-x86_64-linux-gnu.so)
    Error in sys.excepthook:
    Traceback (most recent call last):
    File "/usr/lib/python3/dist-packages/apport_python_hook.py", line 63, in apport_excepthook
    from apport.fileutils import likely_packaged, get_recent_crashes
    File "/usr/lib/python3/dist-packages/apport/__init__.py", line 5, in <module>
    from apport.report import Report
    File "/usr/lib/python3/dist-packages/apport/report.py", line 30, in <module>
    import apport.fileutils
    File "/usr/lib/python3/dist-packages/apport/fileutils.py", line 23, in <module>
    from apport.packaging_impl import impl as packaging
    File "/usr/lib/python3/dist-packages/apport/packaging_impl.py", line 23, in <module>
    import apt File "/usr/lib/python3/dist-packages/apt/__init__.py", line 23, in <module>
    import apt_pkg
    ImportError: /usr/local/MATLAB/R2017a/sys/os/glnxa64/libstdc++.so.6: version
    `GLIBCXX_3.4.21' not found (required by /usr/lib/python3/dist-packages/apt_pkg.cpython-35m-x86_64-linux-gnu.so)

    Original exception was:
    Traceback (most recent call last):
    File "/home/kent/Desktop/SegUtilities/eval_model_PR.py", line 3, in <module>
    import matplotlib.pyplot as plt
    File "/usr/lib/python3/dist-packages/matplotlib/pyplot.py", line 36, in <module>
    from matplotlib.figure import Figure, figaspect
    File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 35, in <module>
    from matplotlib import _image
    ImportError: /usr/local/MATLAB/R2017a/sys/os/glnxa64/libstdc++.so.6: version 
    `GLIBCXX_3.4.21' not found (required by /usr/lib/python3/dist-packages/matplotlib/_image.cpython-35m-x86_64-linux-gnu.so)
    22      inputParts = regexp(inputArray, ';', 'split');