Issues to install openerp on ubuntu 14.04

2014-06-08 19:41:21,496 6749 INFO ? openerp: OpenERP version 7.0-20140606-231109
2014-06-08 19:41:21,496 6749 INFO ? openerp: addons paths: /opt/openerp/server/openerp/addons
2014-06-08 19:41:21,496 6749 INFO ? openerp: database hostname: localhost
2014-06-08 19:41:21,496 6749 INFO ? openerp: database port: 5432
2014-06-08 19:41:21,496 6749 INFO ? openerp: database user: openerp
2014-06-08 19:41:21,620 6749 CRITICAL ? openerp.modules.module: Couldn't load module web
2014-06-08 19:41:21,620 6749 CRITICAL ? openerp.modules.module: No module named unittest2
2014-06-08 19:41:21,621 6749 ERROR ? openerp.service: Failed to load server-wide module `web`.
The `web` module is provided by the addons found in the `openerp-web` project.
Maybe you forgot to add those addons in your addons_path configuration.
Traceback (most recent call last):
  File "/opt/openerp/server/openerp/service/__init__.py", line 60, in load_server_wide_modules
    openerp.modules.module.load_openerp_module(m)
  File "/opt/openerp/server/openerp/modules/module.py", line 405, in load_openerp_module
    __import__('openerp.addons.' + module_name)
  File "/opt/openerp/server/openerp/modules/module.py", line 133, in load_module
    mod = imp.load_module('openerp.addons.' + module_part, f, path, descr)
  File "/opt/openerp/server/openerp/addons/web/__init__.py", line 3, in <module>
    import cli
  File "/opt/openerp/server/openerp/addons/web/cli/__init__.py", line 1, in <module>
    import test_js
  File "/opt/openerp/server/openerp/addons/web/cli/test_js.py", line 5, in <module>
    import unittest2
ImportError: No module named unittest2
2014-06-08 19:41:21,641 6749 INFO ? openerp.service.wsgi_server: HTTP service (werkzeug) running on 0.0.0.0:8069
2014-06-08 19:41:21,644 6749 INFO ? openerp: OpenERP server is running, waiting for connections...
^C2014-06-08 20:18:20,354 6749 INFO ? openerp.service: Initiating shutdown
2014-06-08 20:18:20,354 6749 INFO ? openerp.service: Hit CTRL-C again or send a second signal to force the shutdown.