[Bug 1510730] [NEW] Ubiquity installer crashes when editing manual crypto partition

[David Schoen]

Public bug reported:

Using the Kubuntu 15.10 AMD64 iso.

After selecting to create a manual partition layout, adding a primary /boot (sda1) and a logic crypto by selecting "physical volume for encryption" (sda5), if I select the crypto volume and click "Change...", make no changes and click "OK" ubiquity crashes with:
Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartMan.py", line 453, in on_edit_clicked
    self.partman_edit_dialog(devpart, partition)
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartMan.py", line 367, in partman_edit_dialog
    self.ctrlr.dbfilter.edit_partition(devpart, **edits)
  File "/usr/lib/ubiquity/plugins/ubi-partman.py", line 3289, in edit_partition
    assert self.current_question == 'partman/choose_partition'
AssertionError

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubiquity 2.21.37
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu3
Architecture: amd64
CasperVersion: 1.365
CurrentDesktop: KDE
Date: Tue Oct 27 23:48:21 2015
InstallCmdLine: noprompt cdrom-detect/try-usb=true file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity initrd=/casper/initrd.lz quiet splash --- BOOT_IMAGE=/casper/vmlinuz.efi
LiveMediaBuild: Kubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: ubiquity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug kubuntu ubiquity-2.21.37 wily

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Title:
  Ubiquity installer crashes when editing manual crypto partition

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