问题产生：
在install pkgs时，报错
Collecting package metadata (current_repodata.json): failed
具体为：
conda.core.subdir_data.Response304ContentUnchanged
解决：
-
works for me.
conda clean -i
清空cache后重新安装
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suggestion from Github
conda config --remove channels conda-forge
疑似 forge 源出了问题
