ubuntu16.04 conda創建環境失敗

直接用國外的源可能會報如下錯：

Solving environment: failed

CondaHTTPError: HTTP 000 CONNECTION FAILED for url <https://repo.anaconda.com/pkgs/main/linux-64/repodata.json.bz2>
Elapsed: -

An HTTP error occurred when trying to retrieve this URL.
HTTP errors are often intermittent, and a simple retry will get you on your way.

If your current network has https://www.anaconda.com blocked, please file
a support request with your network engineering team.

ConnectionError(ReadTimeoutError("HTTPSConnectionPool(host='repo.anaconda.com', port=443): Read timed out."))

解決辦法：
修改其包管理鏡像為國內源

conda config --add channels https://mirrors.tuna.tsinghua.edu.cn/anaconda/pkgs/free/
conda config --set show_channel_urls yes

重新新建環境仍舊報錯：

CondaHTTPError: HTTP 000 CONNECTION FAILED for url <https://repo.anaconda.com/pkgs/main/linux-64/libstdcxx-ng-9.1.0-hdf63c60_0.tar.bz2>
Elapsed: -

An HTTP error occurred when trying to retrieve this URL.
HTTP errors are often intermittent, and a simple retry will get you on your way.

ChunkedEncodingError(ProtocolError('Connection broken: OSError("(104, \'ECONNRESET\')")', OSError("(104, 'ECONNRESET')")))

解決辦法：
打開~/.condarc，刪除已有內容，加入如下內容：

channels:
  - defaults
show_channel_urls: true
ssl_verify: false
report_errors: false