Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/UpdateList.py", line 213, in __init__
    with open(self.UNIQ_MACHINE_ID_FILE) as f:
FileNotFoundError: [Errno 2] No such file or directory: '/etc/machine-id'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/update-manager", line 121, in <module>
    app.start_update()
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 209, in start_update
    self.start_available()
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 221, in start_available
    self.refresh_cache()
  File "/usr/lib/python3/dist-packages/UpdateManager/UpdateManager.py", line 347, in refresh_cache
    self.update_list = UpdateList(self)
  File "/usr/lib/python3/dist-packages/UpdateManager/Core/UpdateList.py", line 215, in __init__
    except OSError.FileNotFoundError:
AttributeError: type object 'OSError' has no attribute 'FileNotFoundError'