'Package installer conda failed. Open to other installation means

I think I have an environment problem with miniconda. Here is what I succeded(o)/mismanaged(x) to install python mayavi package. The documentation writes to type :

  • (o) conda install vtk
  • (x) conda install pyqt=4
  • <(x) conda install mayavi> (not performed)

The output message for another cmd (conda install -c anaconda -c conda-forge mayavi) are:

Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: / 

I understand that I must check the first failed package: pyqt. There are similar messages, before the shell windows simply breaks. I have read that an updated environment could work but my OS (fedora35 as virtual machine) and python 3.9 + miniconda3 are fast from best versions. Any suggestion or help to fix this or trying docker are welcome



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