Install Tensorflow in virtual environment python 2.7

Please, how can i install Tensorflow in a virtual environment? I have used these commands but it doesn't work..

sudo -H pip3 install tensorflow  --proxy https://XXX.XX.XX.X:3128

sudo -E pip3 install tensorflow  --proxy https://XXX.XX.XX.X:3128

sudo -E pip install tensorflow  --proxy https://XXX.XX.XX.X:3128

sudo -H pip install tensorflow  --proxy https://XXX.XX.XX.X:3128

sudo  pip install tensorflow  --proxy https://XXX.XX.XX.X:3128

It resulted in:

Downloading/unpacking tensorflow
Cannot fetch index base URL https://pypi.python.org/simple/

These are my python and pip versions:

(venv)root@graphene-62:~/tensorflow# pip -V
pip 8.1.2 from /usr/local/lib/python2.7/dist-packages/pip-8.1.2-py2.7.egg
(python 2.7)
(venv)root@graphene-62:~/tensorflow# python -V
Python 2.7.6

After I tried pip install -U tensorflow, I got the following result:

Cannot uninstall 'six'

Then I tried pip install -U tensorflow --ignore-installed six, and with the tf version check I got:

(venv)root@graphene-62:~/tensorflow# python -c "import tensorflow as tf; print(tf.__version__)" 
Illegal instruction (core dumped) (venv)root@graphene-62:~/tensorflow#

Is there another way to download and install Tensorflow?

Solution

Please make sure that your pip version is up to date with:

pip install -U pip

Then, as per the comments and edited question, execute:

pip install -U tensorflow==1.5.0 --ignore-installed six

This will ignore the six related error and the slightly downgraded tensorflow package will install and be useable without the Illegal Instruction error.

To check if the installation was successfull, execute:

python -c "import tensorflow as tf; print(tf.__version__)"