CQ-editor: Problem with conda installation : failed with initial frozen solve

Hi, I have installed cadquery successfully with:

conda install -c conda-forge -c cadquery cadquery=2

I am trying now to install CQ-editor as explained here. It fails with this messages (extract, cuts = […], full here part 1, part 2):

(base) lalebarde@PC:/opt/openscad$ conda install -c cadquery -c conda-forge cq-editor
Collecting package metadata (current_repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: failed with repodata from current_repodata.json, will retry with next repodata source.
Collecting package metadata (repodata.json): done
Solving environment: failed with initial frozen solve. Retrying with flexible solve.
Solving environment: - 
Found conflicts! Looking for incompatible packages.
This can take several minutes.  Press CTRL-C to abort.
Examining conflict for pluggy astropy spyder pytest-doctestplus [...]

Package mpi conflicts for:
h5py -> openmpi[version='>=4.0.2,<4.1.0a0'] -> mpi==1.0[build='openmpi|mpich']
hdf5 -> mpich[version='>=3.3,<3.4.0a0'] -> mpi==1.0[build='openmpi|mpich']

Package patchelf conflicts for:
anaconda==2019.10 -> patchelf==0.9=he6710b0_3
conda-build -> patchelf

I have also tried the solution here, but without success:

(base) lalebarde@PC:/opt/openscad$ conda env create -f cqgui_env.yml -n cqgui
SpecNotFound: Invalid name, try the format: user/package

I am not a conda user, so I don’t know if the installation sequence for cadquery, then CQ-editor is correct ?