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For anyone else who had this problem, reinstalling everything is not necessary, this should solve your problem :

  1. Ensure that which python returns /usr/bin/python
  2. Also ensure python --version returns Python 2.7.17
  3. Both the first and second point will most likely require you to make changes to your .bashrc, so once you do that source .bashrc
  4. export ROS_PYTHON_VERSION=2

Hope this helps!