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update-manager JSON decoder error

I was trying to update ubuntu from 22.04 to 23.10, but I get the following error when trying to run update-manager:

Unexpected error(s) occurred.For more details, see the log: /var/log/ubuntu-advantage.logTo file a bug run: ubuntu-bug ubuntu-advantage-toolsTraceback (most recent call last):  File "/usr/lib/python3/dist-packages/UpdateManager/backend/InstallBackendAptdaemon.py", line 448, in _on_finished    self._action_done(action,  File "/usr/lib/python3/dist-packages/UpdateManager/backend/__init__.py", line 365, in _action_done    self.window_main.start_available()  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 241, in start_available    self.refresh_cache()  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 459, in refresh_cache    self._get_ua_security_status()  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 285, in _get_ua_security_status    s = json.load(p.stdout)  File "/usr/lib/python3.10/json/__init__.py", line 293, in load    return loads(fp.read(),  File "/usr/lib/python3.10/json/__init__.py", line 346, in loads    return _default_decoder.decode(s)  File "/usr/lib/python3.10/json/decoder.py", line 337, in decode    obj, end = self.raw_decode(s, idx=_w(s, 0).end())  File "/usr/lib/python3.10/json/decoder.py", line 355, in raw_decode    raise JSONDecodeError("Expecting value", s, err.value) from Nonejson.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)

I found this question with the exact same error, but I don't think I have the same problem as which pro returns user/bin/pro. I'm not very experienced in solving issues like these so I have no idea how to fix this or what the issue even is.

I have tried reinstalling, updating and such but to no avail.

Any help is greatly appreciated.


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