Installation issues for Virtualenv and VirtualenvWrapper in Ubuntu 13.04
Question: Ubuntu Server in VirtualBox. I am trying to install VirtualEnv to start
learning Flask and bottle. Some details of my setup.

    
    
    vks@UbSrVb:~$ cat /etc/os-release 
    NAME="Ubuntu"
    VERSION="12.04.2 LTS, Precise Pangolin"
    ID=ubuntu
    ID_LIKE=debian
    PRETTY_NAME="Ubuntu precise (12.04.2 LTS)"
    VERSION_ID="12.04"
    
    vks@UbSrVb:~$ python --version
    Python 2.7.3
    vks@UbSrVb:~$ echo $VIRTUALENVWRAPPER_PYTHON
    /usr/bin/python
    vks@UbSrVb:~$ echo $VIRTUALENV_PYTHON
    
    vks@UbSrVb:~$
    

When I boot my Virtual Machine, I get the following error on my console

    
    
    /usr/bin/python: No module named virtualenvwrapper
    virtualenvwrapper.sh: There was a problem running the initialization hooks. 
    
    If Python could not import the module virtualenvwrapper.hook_loader,
    check that virtualenv has been installed for
    VIRTUALENVWRAPPER_PYTHON=/usr/bin/python and that PATH is
    set properly.
    

When i try to initialize a virtualenv I get the following errors

    
    
    vks@UbSrVb:~/dropbox/venv$ virtualenv try1
    New python executable in try1/bin/python3.2
    Also creating executable in try1/bin/python
    Traceback (most recent call last):
      File "/usr/local/bin/virtualenv", line 9, in <module>
        load_entry_point('virtualenv==1.9.1', 'console_scripts', 'virtualenv')()
      File "/usr/local/lib/python3.2/dist-packages/virtualenv.py", line 979, in main
        no_pip=options.no_pip)
      File "/usr/local/lib/python3.2/dist-packages/virtualenv.py", line 1081, in create_environment
        site_packages=site_packages, clear=clear))
      File "/usr/local/lib/python3.2/dist-packages/virtualenv.py", line 1499, in install_python
        os.symlink(py_executable_base, full_pth)
    OSError: [Errno 30] Read-only file system
    
    
    vks@UbSrVb:~/dropbox/venv$ ls
    try1
    vks@UbSrVb:~/dropbox/venv$ ls try1/
    bin  include  lib
    vks@UbSrVb:~/dropbox/venv$ 
    

My .bashrc entries

    
    
    export WORKON_HOME='~/dropbox/venv/'
    source '/usr/local/bin/virtualenvwrapper.sh'
    

Q1 - As per the error at bootup, How do I ensure _virtualenv_ is installed for
VIRTUALENVWRAPPER_PYTHON=/usr/bin/python and that PATH is set properly ?  
Q2 - Even with sudo I get the same "Read-only file system" Error ?

_I have tried installing virtualenv using pip and then apt-get, just to hit
and try._


Answer: Try setting your WORKON_HOME global to another path (~/.virtualenvs) for
example a see if that works, maybe the problem is with that shared directory,
are you using windows? If you are, try installing ntfs-3g, see
<http://askubuntu.com/questions/70281/why-does-my-ntfs-partition-mount-as-
read-only>

Also in my profile configuration file I like to detect first if
virtualenvwrapper is installed:

    
    
    if which virtualenvwrapper.sh &> /dev/null; then
        WORKON_HOME=$HOME/.virtualenvs
        # path to virtualenvwrapper, in my case
        source /usr/local/share/python/virtualenvwrapper.sh
    fi
    

