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

Preparing transaction: done
Verifying transaction: done
Executing transaction: done
ERROR conda.core.link:_execute(637): An error occurred while installing package 'None'.
AssertionError()
Attempting to roll back.

Rolling back transaction: done

AssertionError()
()

Answer 1

当我失败时，该命令conda install conda也对我有用conda install anaconda。我不确定为什么后者不起作用。否则我会得到ERROR conda.core.link:_execute(637)错误。