Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/defer/__init__.py", line 487, in _inline_callbacks
    result.traceback)
  File "/usr/lib/python2.7/dist-packages/aptdaemon/gtk3widgets.py", line 673, in _run
    yield self._transaction.run()
TransactionFailed: Transaction failed: The package system is broken
 The following packages have unmet dependencies:

python3-update-manager: Depends: python3-distupgrade but it is not installed
ubuntu-release-upgrader-core: Depends: python3-distupgrade (= 1:0.165) but it is not installed
ubuntu-release-upgrader-gtk: Depends: ubuntu-release-upgrader-core (= 1:0.165) but 1:0.165 is installed
                             Depends: python3-distupgrade (= 1:0.165) but it is not installed