pypiのeasy_installコマンドについて

easy_installコマンドを使いたいと思い、pypiをインストールしたいと思いました。いろいろ調べ、
$ wget http://peak.telecommunity.com/dist/ez_setup.py
$ python ez_setup.py
を実行しました。しかし
error: can't create or remove files in install directory

The following error occurred while trying to add or remove files in the
installation directory:

[Errno 13] Permission denied: '/usr/local/lib/python2.7/dist-packages/test-easy-install-13804.write-test'

The installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:

/usr/local/lib/python2.7/dist-packages/

Perhaps your account does not have write access to this directory? If the
installation directory is a system-owned directory, you may need to sign in
as the administrator or "root" account. If you do not have administrative
access to this machine, you may wish to choose a different installation
directory, preferably one that is listed in your PYTHONPATH environment
variable.

For information on other options, you may wish to consult the
documentation at:

https://pythonhosted.org/setuptools/easy_install.html

Please make the appropriate changes for your system and try again.
が表示されてしまい、うまく行きません。
osはubuntでpythonは3.x系を使っています。どうか、回答のほどよろしくお願いします。