dm-crypt partition password dialog not implemented in manual partitioning step

[Philip Muškovac]

WARNING: unknown widget: partition_edit_dialog
Type: <class 'PyQt5.QtWidgets.QDialog'>
Exception in KDE frontend (invoking crash handler):
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 3286, in edit_partition
    assert self.current_question == 'partman/choose_partition'
AssertionError

Steps to reproduce:
- Open Ubiquity on the Kubuntu 18.04.1 image
- Proceed until Disk Setup
- Select manual partitioning
- create a partition with type 'physical volume for encryption'
- Click on Install Now

Current behavior:
Nothing happens, and the above trace is put into the log

Expected behavior:
A dialog pops up where you set the encryption password

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity-frontend-kde 18.04.14.9
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CasperVersion: 1.394
CurrentDesktop: KDE
Date: Fri Dec 28 11:00:24 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity quiet splash ---
LiveMediaBuild: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
PackageArchitecture: all
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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