CondaVerificationError on attempting to create conda environment (possible Win10 issue?)

[brianhmiller]

I am running from Miniconda installed on a Windows 10 Pro machine. I was able to reproduce this issue from a completely fresh install of Miniconda.

I followed the installation instructions from: https://github.com/jupyter-widgets/tutorial#installation

Git cloning was successful:
git clone https://github.com/jupyter-widgets/tutorial.git

I then attempted to create the environment, but I failed with CondaVerificationError and also saw some ClobberWarnings:

(base) PS C:\jupyter\tutorial> conda env create -f environment.yml
Collecting package metadata (repodata.json): done
Solving environment: done
Preparing transaction: done
Verifying transaction: failed

CondaVerificationError: The package for sidecar located at C:\Users\bhmiller\Miniconda3\pkgs\sidecar-0.5.1-pyhd8ed1ab_0
appears to be corrupted. The path 'share/jupyter/labextensions/@jupyter-widgets/jupyterlab-sidecar/static/vendors-node_modules_css-loader_dist_runtime_api_js-node_modules_css-loader_dist_runtime_cssW-926fd9.949facbe71846c90da88.js.map'
specified in the package manifest cannot be found.

ClobberWarning: This transaction has incompatible packages due to a shared path.
  packages: conda-forge/noarch::bqplot-0.12.29-pyhd8ed1ab_0, conda-forge/noarch::ipygany-0.5.0-pyhd8ed1ab_0
  path: 'lib/site-packages/tests/__init__.py'


ClobberWarning: This transaction has incompatible packages due to a shared path.
  packages: conda-forge/noarch::bqplot-0.12.29-pyhd8ed1ab_0, conda-forge/noarch::ipygany-0.5.0-pyhd8ed1ab_0
  path: 'lib/site-packages/tests/__pycache__/__init__.cpython-38.pyc'"