conda 安装宏基因组软件megahit出现CondaHTTPError: HTTP 000 CONNECTION FAILED for url问题

使用conda 安装MEGAHIT 软件时，出现 Solving environment: failed CondaHTTPError: HTTP 000 CONNECTION FAILED for url <https://repo.anaconda.com/pkgs/r/linux-64/repodata.json.bz2>：的错误：

直接安装

$ ./conda install -c bioconda megahit
Solving environment: failed

CondaHTTPError: HTTP 000 CONNECTION FAILED for url <https://repo.anaconda.com/pkgs/r/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.

.....

报错，显示没有源。

配置最新的清华源。这注意必须是最新的，有些旧的不能使用，可以点击链接去看看最新的源是什么？

# vi ~/.condarc 

把下列内容拷进去，保存.condarc文件

channels:
  - https://mirrors.tuna.tsinghua.edu.cn/