ERROR: wxGUI requires wxPython

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Q: I'm trying to start the graphical user interface but it tells me

ERROR: wxGUI requires wxPython. No module named 'wx'

A: The solution depends on the operating system in use. In general, the package "python3-wxPython" (naming may vary) is needed.

Things to verify:

  • do you use Anaconda? Please check if you have colliding Python versions. If not, read on below.

Linux specific notes:

Conda related notes (note that many user actually do not use conda):