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robot framework 中 netconf 库安装错误

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robot framework 中 netconf 库安装错误

我尝试为机器人框架安装 netconf 库，但出现以下错误：

root@stack-ThinkCentre-M83:~/tests# pip install robotframework-ncclient

The directory '/home/stack/.cache/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. 
Please check the permissions and owner of that directory. 
If executing pip with sudo, you may want sudo's -H flag.

The directory '/home/stack/.cache/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. 
Please check the permissions and owner of that directory. 
If executing pip with sudo, you may want sudo's -H flag.

Collecting robotframework-ncclient
  Could not fetch URL https://pypi.python.org/simple/robotframework-ncclient/: There was a problem confirming the ssl certificate: [SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed (_ssl.c:590) - skipping
  Could not find a version that satisfies the requirement robotframework-ncclient (from versions: )

No matching distribution found for robotframework-ncclient

我尝试了机器人框架的版本检查并返回了以下内容

Robot Framework 2.8.4 (Python 2.7.12 on linux2)

我应该怎么办？

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