[Solved]-My Django installs in virtual env are missing admin templates folder

To solve this issue you should use “–no-binary” while installing django.

pip install --no-binary django -r requirements.txt 

or

pip install --no-binary django django==1.4.21

Remember to upgrade your PIP installation to have the “–no-binary” option.

You can get further information in this link:
https://github.com/pypa/pip/issues/2823