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
** Changed in: ubuntu-release-upgrader (Ubuntu)
Importance: Critical => High
** Also affects: ubuntu-release-upgrader (Ubuntu Xenial)
Importance: High
Status: Confirmed
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** Changed in: ubuntu-release-upgrader (Ubuntu)
Importance: Undecided => Critical
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https://bugs.launchpad.net/bugs/1509655
Title:
installer crashed on custom configuration file
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: ubuntu-release-upgrader (Ubuntu)
Status: New => Confirmed
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** Package changed: ubiquity (Ubuntu) => ubuntu-release-upgrader
(Ubuntu)
** Tags added: kubuntu wily
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https://bugs.launchpad.net/bugs/1509655
Title:
installer crashed on custom
Addition: after killing the frozen installer gui and running 'sudo dpkg
--configure -a' in terminal to continue the installation manually, I
indeed got the prompt about /etc/tomcat7/server.xml and whether I want
the maintainer's version, the current version, to view diff, etc.
However, after
