[ubuntu] Problems installing virtualenv & virtualenvwrapper

I am trying to install virtualenv and wrapper and I get the following error:

IOError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/pymongo-2.4.2.egg-info/top_level.txt'

I indeed dont have permission to that file.

I have tried doing everything when in the root account and most of it works,
except when I come to actually using virtualenv.

When I "source" for a new environment, it does not work, and "sudo source" doesnt work, as we know.

Today I discovered that I get the same error when doing "pip freeze" so it is an access problem but
I do not know how to solve this...

appreciate the help, thanks...