Errors while installing designate dashboard package in ubuntu 18.04

Hi, I am facing the following error while installing python-designate-dashboard package in my ubuntu18.04

Traceback (most recent call last):
  File "/usr/share/openstack-dashboard/manage.py", line 25, in <module>
    execute_from_command_line(sys.argv)
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 364, in execute_from_command_line
    utility.execute()
  File "/usr/local/lib/python2.7/dist-packages/django/core/management/__init__.py", line 308, in execute
    settings.INSTALLED_APPS
  File "/usr/local/lib/python2.7/dist-packages/django/conf/__init__.py", line 56, in __getattr__
    self._setup(name)
  File "/usr/local/lib/python2.7/dist-packages/django/conf/__init__.py", line 41, in _setup
    self._wrapped = Settings(settings_module)
  File "/usr/local/lib/python2.7/dist-packages/django/conf/__init__.py", line 110, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/lib/python2.7/importlib/__init__.py", line 37, in import_module
    __import__(name)
  File "/usr/share/openstack-dashboard/openstack_dashboard/settings.py", line 28, in <module>
    from horizon.utils.escape import monkeypatch_escape
ImportError: No module named horizon.utils.escape
dpkg: error processing package python-designate-dashboard (--configure):
 installed python-designate-dashboard package post-installation script subprocess returned error exit status 1
Errors were encountered while processing:
 python-designate-dashboard
E: Sub-process /usr/bin/dpkg returned an error code (1)

Please help.
TIA.