问题：

conda 创建新的虚拟环境时报错

Collecting package metadata (current_repodata.json): done
Solving environment: done

# >>>>>>>>>>>>>>>>>>>>>> ERROR REPORT <<<<<<<<<<<<<<<<<<<<<<

    Traceback (most recent call last):
      File "/home/xxx/anaconda3/lib/python3.10/site-packages/conda/gateways/repodata/__init__.py", line 132, in conda_http_errors
        yield
      File "/home/xxx/anaconda3/lib/python3.10/site-packages/conda/gateways/repodata/__init__.py", line 101, in repodata
        response.raise_for_status()
      File "/home/xxx/anaconda3/lib/python3.10/site-packages/requests/models.py", line 1022, in raise_for_status
        raise HTTPError(http_error_msg, response=self)
    requests.exceptions.HTTPError: 404 Client Error: Not Found for url: https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/linux-64/current_repodata.json
    
    During handling of the above exception, another exception occurred:
    
    Traceback (most recent call last):
      File "/home/xxx/anaconda3/lib/python3.10/site-packages/requests/models.py", line 972, in json
        return complexjson.loads(self.text, **kwargs)
      File "/home/xxx/anaconda3/lib/python3.10/site-packages/simplejson/__init__.py", line 514, in loads
        return _default_decoder.decode(s)
      File "/home/xxx/anaconda3/lib/python3.10/site-packages/simplejson/decoder.py", line 386, in decode
        obj, end = self.raw_decode(s)
      File "/home/xxx/anaconda3/lib/python3.10/site-packages/simplejson/decoder.py", line 416, in raw_decode
        return self.scan_once(s, idx=_w(s, idx).end())
    simplejson.errors.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
    
    During handling of the above exception, another exception occurred:

解决办法

conda config --remove-key channels
conda config --append channels conda-forge --append channels bioconda --append channels defaults

参考

Conda更新报错:requests.exceptions.HTTPError: 404