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~$ python3 --version
Python 3.4.3
~$ python3 -m venv PyHardLinkBackup
Error: Command '['/home/jens/PyHardLinkBackup/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']' returned non-zero exit status 1

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~$ rm -Rf PyHardLinkBackup/

~$ python3 -m venv --without-pip PyHardLinkBackup
~$ cd PyHardLinkBackup/
~/PyHardLinkBackup$ source bin/activate
(PyHardLinkBackup) ~/PyHardLinkBackup$ which python
/home/jens/PyHardLinkBackup/bin/python
(PyHardLinkBackup) ~/PyHardLinkBackup$ python --version
Python 3.4.3
(PyHardLinkBackup) ~/PyHardLinkBackup$ python -m ensurepip
/home/jens/PyHardLinkBackup/bin/python: No module named ensurepip

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$ python3
Python 3.4.3 (default, Mar 26 2015, 22:07:01) 
[GCC 4.9.2] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import ensurepip
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named 'ensurepip'

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python -m ensurepip
ensurepip is disabled in Debian/Ubuntu for the system python.

Python modules For the system python are usually handled by dpkg and apt-get.

    apt-get install python-<module name>

Install the python-pip package to use pip itself.  Using pip together
with the system python might have unexpected results for any system installed
module, so use it on your own risk, or make sure to only use it in virtual
environments.