pip未更新到最新版本

当我运行

pip安装-U pip

时，它不会安装较新的版本

drahcir@Altair:~/dev$ pip --version
pip 1.5.6 from /usr/lib/python2.7/dist-packages (python 2.7)
drahcir@Altair:~/dev$ pip install -U pip
Downloading/unpacking pip
  Downloading pip-8.1.2-py2.py3-none-any.whl (1.2MB): 1.2MB downloaded
Installing collected packages: pip
Successfully installed pip
Cleaning up...
drahcir@Altair:~/dev$ pip --version
pip 1.5.6 from /usr/lib/python2.7/dist-packages (python 2.7)

尽管它说下载了pip 8.1.2，但pip版本仍然是1.5.6

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如何让pip升级到8.1.2？

您最初是如何安装的

pip

？Ubuntu与python捆绑销售，pip您最初是如何安装的

pip

？Ubuntu与python和pip捆绑销售