Kubuntu installer crashes when toggling the checkbox to format an existing partition, in the manual partitioner

[Christopher Cormier]

When installing Kubuntu 18.10, I was attempting to re-use and format my previous root partition in the manual partitioner. However after exiting out of the "Change..." menu, I realized I forgot to set the partition to be formatted, so I checked the box next to it, causing Ubiquity to crash.

From what I can tell of a cursory glance of the traceback, it appears to specifically be a bug in the KDE frontend.

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: ubiquity 18.10.2
ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17
Uname: Linux 4.15.0-22-generic x86_64
ApportVersion: 2.20.10-0ubuntu3
Architecture: amd64
CasperVersion: 1.394
CurrentDesktop: KDE
Date: Fri Jun 1 15:37:19 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity quiet splash ---
LiveMediaBuild: Kubuntu 18.10 "Cosmic Cuttlefish" - Alpha amd64 (20180601)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Xavier Gnata (xavier-gnata-gmail)]

This is an old unresolved bug :
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1687637