[Bug 1724058] Re: installer crashed after marking / (root) for formatting

[Łukasz Zemczak]

Encountered the same issue during ISO Testing. From the traceback I see
this should be really simple to fix.

As a workaround for those that do encounter this bug, ubiquity only crashes when the format checkbox is checked in the main partition list view. If you click on the partition, then Edit and check the format checkbox in the edit form, all succeeds and the partition is marked for formatting correctly.
Let me update the bug report.

** Description changed:

- installer crashed after marking / (root) for formatting
+ Installer crashed after attempting to check the 'format partition'
+ checkbox for / (root) in the main partition list view. Partition can
+ still be marked for formatting correctly by selecting the partition,
+ editing it and marking the checkbox on the edit dialog-box.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubiquity 17.10.7
  ProcVersionSignature: Ubuntu 4.13.0-12.13-generic 4.13.3
  Uname: Linux 4.13.0-12-generic x86_64
  ApportVersion: 2.20.7-0ubuntu1
  Architecture: amd64
  CasperVersion: 1.384
  CurrentDesktop: KDE
  Date: Mon Oct 16 19:32:11 2017
  InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity quiet splash ---
  LiveMediaBuild: Kubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170926)
  SourcePackage: ubiquity
  UpgradeStatus: No upgrade log present (probably fresh install)

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Title:
  installer crashed after marking / (root) for formatting

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