Jammy support is missing

The memcached charm does not support the 'jammy' series.

unit-memcached-0: 19:31:54 WARNING unit.memcached/0.install E: Package 'python-apt' has no installation candidate
unit-memcached-0: 19:31:54 WARNING unit.memcached/0.install E: Package 'python-netaddr' has no installation candidate
unit-memcached-0: 19:31:55 WARNING unit.memcached/0.install E: Unable to locate package python-netifaces
unit-memcached-0: 19:31:55 WARNING unit.memcached/0.install E: Package 'python-yaml' has no installation candidate
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install Traceback (most recent call last):
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install File "/var/lib/juju/agents/unit-memcached-0/charm/hooks/charmhelpers/core/strutils.py", line 92, in __init__
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install self.index = self._list.index(item)
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install ValueError: tuple.index(x): x not in tuple
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install During handling of the above exception, another exception occurred:
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install Traceback (most recent call last):
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install File "/var/lib/juju/agents/unit-memcached-0/charm/hooks/install.real", line 454, in <module>
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install main()
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install File "/var/lib/juju/agents/unit-memcached-0/charm/hooks/install.real", line 448, in main
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install hooks.execute(sys.argv)
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install File "/var/lib/juju/agents/unit-memcached-0/charm/hooks/charmhelpers/core/hookenv.py", line 934, in execute
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install self._hooks[hook_name]()
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install File "/var/lib/juju/agents/unit-memcached-0/charm/hooks/install.real", line 82, in install
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install if CompareHostReleases(ubuntu_rel) == "trusty":
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install File "/var/lib/juju/agents/unit-memcached-0/charm/hooks/charmhelpers/core/strutils.py", line 94, in __init__
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install raise KeyError("Item '{}' is not in list '{}'"
unit-memcached-0: 19:32:00 WARNING unit.memcached/0.install KeyError: "Item 'jammy' is not in list '('lucid', 'maverick', 'natty', 'oneiric', 'precise', 'quantal', 'raring', 'saucy', 'trusty', 'utopic', 'vivid', 'wily', 'xenial', 'yakkety', 'zesty', 'artful', 'bionic', 'cosmic', 'disco', 'eoan', 'focal')'"
unit-memcached-0: 19:32:00 ERROR juju.worker.uniter.operation hook "install" (via explicit, bespoke hook script) failed: exit status 1
unit-memcached-0: 19:32:00 INFO juju.worker.uniter awaiting error resolution for "install" hook