Install the specified pip version, python2.6.6 is not supported after pip10.

Prepare:

https://pypi.org Go to the website to download the desired version of pip

View the corresponding historical version

1. Installation

1. Install pip with apt-get

$ sudo apt-get remove python-pip

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But sometimes the version of pip installed through apt-get is too old, and when some packages are installed using the old version of pip, a reminder will be reported to upgrade pip. If you want to upgrade the latest pip, you need to uninstall pip first, the command is

sudo apt-get remove python-pip

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Then install pip from source according to the following method.

2. Install pip from source

Go to  https://pypi.python.org/pypi/pip to  download the source code of the corresponding version. It is recommended to use this compressed format: pip-9.0.1.tar.gz, then go to the download directory, unzip and enter the file :

$ tar -xzvf pip-9.0.1.tar.gz
$ cd pip-9.0.1

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When entering the following

$ python setup.py install

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May report an error:

running install
error: can't create or remove files in install directory

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This is because of insufficient permissions, enter the following command:

$ sudo python setup.py install

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Then execute the following, the installation is successful.

running install
... ...
Processing dependencies for pip==9.0.1
Finished processing dependencies for pip==9.0.1