已解决：You are using pip version 8.1.1, however version 20.2.3 is available. You should consider upgrad

说在前面：

该问题是本人遇到的非常多次的一个问题了，网上方法一直难以解决。

Linux 下ubuntu 16.04 自带的都是python 2.7. 因为以前改默认python版本会导致后面犯很多错误，但是每次用pip都会出现标题的问题，用网上大多数方法没法解决。pip版本和python版本不匹配。当然你可以使用anaconda来管理，这样会方便很多。但是anaconda2的版本又会和ROS有些冲突，anaconda3又需要改变默认python版本。诶，难。建议新手不要学习网上一些动不动就动用软链接的方法，不然刷机是常态。

以下这3种方法我通通都不行

python -m pipinstall--upgrade

pipinstall--upgrade pip --force-reinstall

python -m pip install-U pip

解决方法：

python -m pipinstall-i https://pypi.tuna.tsinghua.edu.cn/simple --upgrade pip

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