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[Launchpad Bug Tracker <2039225@xxxxxxxxxxxxxxxxxx>]

This bug was fixed in the package horizon - 4:23.3.0-0ubuntu1.1

---------------
horizon (4:23.3.0-0ubuntu1.1) mantic; urgency=medium

  * d/p/ubuntu_settings.patch, d/p/switch-to-pymemcachecache-backend.patch,
    d/control: Switch to python3-pymemcache and PyMemcacheCache driver as
    the Django MemcachedCache backend was removed in Django 4.1 in favor of
    the PyMemcacheCache or PyLibMCCache backend (LP: #2039225).
  * d/p/ubuntu_settings.patch: Rebase and apply on top of
    switch-to-pymemcachecache-backend.patch.
  * d/gbp.conf: Create stable/2023.2 branch.
  * d/gbp.conf, .launchpad.yaml: Sync from cloud-archive-tools for
    bobcat.

 -- Corey Bryant <corey.bryant@xxxxxxxxxxxxx>  Thu, 26 Oct 2023 14:38:06
-0400

** Changed in: horizon (Ubuntu Mantic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/2039225

Title:
  django.core.cache.backends.memcached.MemcachedCache backend is
  removed

Status in OpenStack Dashboard Charm:
  In Progress
Status in Ubuntu Cloud Archive:
  Triaged
Status in Ubuntu Cloud Archive bobcat series:
  Fix Committed
Status in OpenStack Dashboard (Horizon):
  Fix Released
Status in horizon package in Ubuntu:
  Fix Released
Status in horizon source package in Mantic:
  Fix Released

Bug description:
  [Description]
  In 4.1 the django.core.cache.backends.memcached.MemcachedCache backend is removed.

  https://github.com/django/django/blob/main/docs/releases/4.1.txt#L749

  It's been deprecated since 3.2:

  https://docs.djangoproject.com/en/4.2/releases/3.2/#features-
  deprecated-in-3-2

  "The django.core.cache.backends.memcached.MemcachedCache backend is
  deprecated as python-memcached has some problems and seems to be
  unmaintained. Use django.core.cache.backends.memcached.PyMemcacheCache
  or django.core.cache.backends.memcached.PyLibMCCache instead."

  This results in the following error on Ubuntu Mantic:

  InvalidCacheBackendError at /
  Could not find backend 'django.core.cache.backends.memcached.MemcachedCache': Module "django.core.cache.backends.memcached" does not define a "MemcachedCache" attribute/class
  Request Method:	GET
  Request URL:	http://10.5.3.66/horizon/
  Django Version:	4.2.4
  Exception Type:	InvalidCacheBackendError
  Exception Value:
  Could not find backend 'django.core.cache.backends.memcached.MemcachedCache': Module "django.core.cache.backends.memcached" does not define a "MemcachedCache" attribute/class
  Exception Location:	/usr/lib/python3/dist-packages/django/core/cache/__init__.py, line 49, in create_connection
  Python Executable:	/usr/bin/python3
  Python Version:	3.11.6
  Python Path:
  ['/usr/lib/python3/dist-packages',
   '/usr/lib/python311.zip',
   '/usr/lib/python3.11',
   '/usr/lib/python3.11/lib-dynload',
   '/usr/local/lib/python3.11/dist-packages',
   '/usr/lib/python3/dist-packages',
   '/usr/lib/python3/dist-packages/openstack_dashboard']
  Server time:	Thu, 12 Oct 2023 20:44:30 +0000

  [Test Case]
  Deploy openstack with the openstack-dashboard (horizon) on Ubuntu mantic. Ensure the dashboard is functional and no errors in /var/log/apache/error.log.

  [Regression Potential]
  This fix is inline with the upstream. Currently the dashboard is not functional without this fix.

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