The isssue seems an incorrectly handler of error cases

'Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 604, in 
msg_reply_handler
    reply_handler(*message.get_args_list(**get_args_opts))
  File 
"/usr/lib/python3/dist-packages/softwareproperties/gtk/LivepatchPage.py", line 
363, in _enabled_reply_handler
    timeout=1200)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 137, in __call__
    **keywords)
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 584, in 
call_async
    message.append(signature=signature, *args)
TypeError: Expected a string or unicode object'


Looking at some of the reports their journal log have such errors

'canonical-livepatch[851]: cannot disable machine: cannot send request: Delete 
https://livepatch.canonical.com/api/machine-tokens: net/http: TLS handshake 
timeout
update-notifier.desktop[1556]: ERROR:dbus.connection:Unable to set arguments 
(True, None) according to signature 'bs': <class 'TypeError'>: Expected a 
string or unicode object'

or

'canonical-livepatch[1161]: error in livepatch check state: check-failed
canonical-livepatch[1161]: No payload available.
update-notifier.desktop[3255]: ERROR:dbus.connection:Unable to set arguments 
(False, None) according to signature 'bs': <class 'TypeError'>: Expected a 
string or unicode object'

** Changed in: software-properties (Ubuntu)
   Importance: Undecided => High

** Changed in: software-properties (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1830348

Title:
  /usr/bin/software-properties-
  gtk:TypeError:msg_reply_handler:_enabled_reply_handler:__call__:call_async

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