Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/aptdaemon/errors.py", line 198, in _convert_dbus_exception
    return func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/aptdaemon/client.py", line 778, in cancel
    error_handler=error_handler)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.debian.apt: Could not cancel transaction

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/aptdaemon/gtk3widgets.py", line 452, in _on_clicked
    transaction.cancel()
  File "/usr/lib/python3/dist-packages/defer/utils.py", line 107, in _deferable
    return func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/aptdaemon/errors.py", line 200, in _convert_dbus_exception
    raise get_native_exception(error)
aptdaemon.errors.AptDaemonError: org.debian.apt: Could not cancel transaction