[Bug 1805685] Re: KDE front-end crashes on start up - ubiqity-dm and live session

[Rik Mills]

I believe we need to cherry pick this commit from KDE Neon's fork of
ubiquity.

https://packaging.neon.kde.org/forks/ubiquity.git/commit/?h=Neon/release&id=716f0ce69fca8d624240512ae5560268be8c32ab

Manually applying that change to kde_ui.py in the live session allows
ubiquity to start, and complete an install.

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Title:
  KDE front-end crashes on start up - ubiqity-dm and live session

Status in ubiquity package in Ubuntu:
  New

Bug description:
  Version: 19.04.2
  Release: Disco Dingo 19.04
  Kubuntu live iso: 20181128

  Crash occurs in ubiquity-dm, where a dialog reports an unecoverable
  error, and that a live session will be started.

  Started ubiqity in the live session shows a segfault.

  ~$ ubiquity -d
  /usr/bin/ubiquity:74: DeprecationWarning: the imp module is deprecated in favour of importlib; see the module's documentation for alternative uses
    import imp
  Segmentation fault (core dumped)

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: ubiquity 19.04.2
  ProcVersionSignature: Ubuntu 4.18.0-11.12-generic 4.18.12
  Uname: Linux 4.18.0-11-generic x86_64
  ApportVersion: 2.20.10-0ubuntu14
  Architecture: amd64
  CasperVersion: 1.401
  CurrentDesktop: KDE
  Date: Wed Nov 28 18:38:47 2018
  InstallCmdLine: file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity initrd=/casper/initrd quiet splash --- maybe-ubiquity
  LiveMediaBuild: Kubuntu 19.04 "Disco Dingo" - Alpha amd64 (20181128.1)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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