can't install virtualenv on ubuntu 12.04

问题

i have to install virtualenv on ubuntu 12.04 but it shows following error

sudo pip install virtualenv
[sudo] password for raushan: 
Downloading/unpacking virtualenv
  Cannot fetch index base URL http://pypi.python.org/simple/
  Could not find any downloads that satisfy the requirement virtualenv
No distributions at all found for virtualenv
Storing complete log in /home/raushan/.pip/pip.log

回答1:

Cannot fetch index base URL http://pypi.python.org/simple/

It sounds like you're unable to access PyPi.

Try navigating to http://pypi.python.org/simple/ in your browser to see if you're able to connect. Do you use a proxy to access websites?

It may also be useful to check if you're able to access PyPi from the command line. Try:

wget http://pypi.python.org/simple/

If you're using a proxy, enable that on the command line:

export HTTP_PROXY="http://your.proxy.address.com:8000"
export HTTPS_PROXY=$HTTP_PROXY

replacing your proxy address and the port with whichever details you have.

回答2:

If you are trying to install it on ubuntu, then try this

sudo apt-get install python-virtualenv

This will work fine.

回答3:

it happens because of heavy load on http://pypi.python.org. other alternatives are the mirror site.download the package from mirror site like mirror site and use this command on terminal >> python setup.py install

回答4:

If you are getting this Error as follow while Yum Update or yum install :

Error: Cannot retrieve metalink for repository: fedora/18/x86_64. Please verify its path and try again

Answer : Please check your Proxies i.e env variables 1. http_proxy 2. https_proxy 3. http_proxy in the /etc/yum.conf

Enter the proxy like :

export http_proxy=xxx.xxx.xxx.xxx:port_no
export https_proxy=xxx.xxx.xxx.xxx:port_no

回答5:

Create your own Python virtual environment called : I have given it VE.

git clone https://github.com/pypa/virtualenv.git

python virtualenv.py VE

To Activate your new virtual environment, run:

. VE/bin/activate Sample outputs (NOTE prompt changed): (VE)c34299@a200dblr$

Delete the cloned repo afterwards.

来源：https://stackoverflow.com/questions/19331782/cant-install-virtualenv-on-ubuntu-12-04