Conda error on update: `conda.core.link:_execute(637): An error occurred while installing package 'None'. AssertionError()`

Question

Today when updating conda via conda update --all it downloads several packages and nearly completes installation but at the end, gives

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Answer 1

The command conda install conda worked for me also when conda install anaconda failed for me. I am not sure why the latter does not work though. Otherwise I would get the ERROR conda.core.link:_execute(637) error.