Public bug reported:

I'm running Kubuntu 18.04 from USB, trying to install into a GPT HDD.

- Navigate Ubuntu installer until you reach Disk Setup
- Create Partition sda6, Use as: "physical volume for encryption"
    - I can't find how to create any partitions within the encrypted partition.
- Undo all changes

Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartMan.py", line 
468, in on_undo_clicked
    self.ctrlr.dbfilter.undo()
  File "/usr/lib/ubiquity/plugins/ubi-partman.py", line 3305, in undo
    assert self.current_question == 'partman/choose_partition'
AssertionError

I get the feeling you tried to switch self.current_question to "create
partitions within encrypted volume", but the wizard was still showing
the partitioning screen.

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CasperVersion: 1.394
CurrentDesktop: KDE
Date: Mon Jul 23 01:14:00 2018
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz file=/cdrom/preseed/kubuntu.seed 
boot=casper maybe-ubiquity quiet splash ---
LiveMediaBuild: Kubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug bionic kubuntu ubiquity-18.04.14

** Attachment added: "logs.7z"
   https://bugs.launchpad.net/bugs/1783033/+attachment/5166507/+files/logs.7z

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https://bugs.launchpad.net/bugs/1783033

Title:
  Ubiquity Disk Setup crashes (AssertionError) on "Undo all changes"

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