ImportError：在Ubuntu 11.04服务器上的django项目中，没有名为mysql.base的模块

settings.py

DATABASES = {
    \'default\': {
        \'ENGINE\': \'mysql\',               # Add \'postgresql_psycopg2\', \'mysql\', \'sqlite3\' or \'oracle\'.
        \'NAME\': \'mydatabase\',                  # Or path to database file if using sqlite3.
        \'USER\': \'myname\',                # Not used with sqlite3.
        \'PASSWORD\': \'mypassword\',        # Not used with sqlite3.
        \'HOST\': \'\',                      # Set to empty string for localhost. Not used with sqlite3.
        \'PORT\': \'\',                      # Set to empty string for default. Not used with sqlite3.
    }
}

Validating models...

Traceback (most recent call last):
  File \"/home/me/workspace/mysite/src/mysite/manage.py\", line 14, in <module>
    execute_manager(settings)
  File \"/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py\", line 442, in execute_manager
    utility.execute()
  File \"/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py\", line 379, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
  File \"/usr/local/lib/python2.7/dist-packages/django/core/management/base.py\", line 191, in run_from_argv
    self.execute(*args, **options.__dict__)
  File \"/usr/local/lib/python2.7/dist-packages/django/core/management/base.py\", line 220, in execute
    output = self.handle(*args, **options)
  File \"/usr/local/lib/python2.7/dist-packages/django/core/management/commands/runserver.py\", line 67, in handle
    self.run(*args, **options)
  File \"/usr/local/lib/python2.7/dist-packages/django/core/management/commands/runserver.py\", line 78, in run
    self.inner_run(*args, **options)
  File \"/usr/local/lib/python2.7/dist-packages/django/core/management/commands/runserver.py\", line 88, in inner_run
    self.validate(display_num_errors=True)
  File \"/usr/local/lib/python2.7/dist-packages/django/core/management/base.py\", line 243, in validate
    from django.core.management.validation import get_validation_errors
  File \"/usr/local/lib/python2.7/dist-packages/django/core/management/validation.py\", line 3, in <module>
    from django.contrib.contenttypes.generic import GenericForeignKey, GenericRelation
  File \"/usr/local/lib/python2.7/dist-packages/django/contrib/contenttypes/generic.py\", line 7, in <module>
    from django.db import connection
  File \"/usr/local/lib/python2.7/dist-packages/django/db/__init__.py\", line 27, in <module>
    connection = connections[DEFAULT_DB_ALIAS]
  File \"/usr/local/lib/python2.7/dist-packages/django/db/utils.py\", line 81, in __getitem__
    backend = load_backend(db[\'ENGINE\'])
  File \"/usr/local/lib/python2.7/dist-packages/django/db/utils.py\", line 23, in load_backend
    return import_module(\'.base\', backend_name)
  File \"/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py\", line 35, in import_module
    __import__(name)
ImportError: No module named mysql.base