The reason of the problem is visible in the python backtrace of the bug
description, where line 339 of DistUpgradeViewKDE.py causes a TypeError:
File
"/tmp/ubuntu-release-upgrader-7bai3dvc/DistUpgrade/DistUpgradeViewKDE.py", line
339, in conffile
self.confDialogue.show_difference_button.clicked.connect(self.showConffile())
TypeError: argument 1 has unexpected type 'NoneType'
That python code line should most probably be:
self.confDialogue.show_difference_button.clicked.connect(self.showConffile)
i.e. the argument of the connect method should be the self.showConffile
method itself, not the return value of that method (I suppose it returns
None, which triggers the TypeError).
The problem comes from bug #1423279, which fixed a syntax error, but
apparently introduced this other error. The problem has been reported
also in bug #1448380, which has been marked fixed for some reason that I
fail to understand.
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https://bugs.launchpad.net/bugs/1509655
Title:
installer crashed on custom configuration file dialog
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