[Bug 1589048] [NEW] Kubuntu 16.04 install crashes setting up encrypted partition

[Nick Andrew]

Public bug reported:

512 GB SSD already has Windows 8 installed. I shrank the Windows C:
partition to 150 GB which left around 350 GB free space.

I had already made a bootable USB drive for Kubuntu with unetbootin.
After booting from USB and attempting to use the "Install to hard disk"
and selecting manual partitioning, I tried first to create an 8 GB swap
partition and then a crypto partition. The installer refused a swap
partition outside the crypto partition.

Next I tried to create the crypto partition by itself. When I selected
the option I expected the dialog box to extend with passphrase entry
fields but it did not. I cannot select "format the partition" nor a
mount point, and the installation cannot proceed. Eventually a python
error is reported.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.63
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
ApportVersion: 2.20.1-0ubuntu2
Architecture: amd64
CasperVersion: 1.376
CurrentDesktop: KDE
Date: Sat Jun  4 06:46:00 2016
InstallCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity quiet splash ---
LiveMediaBuild: Kubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

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


** Tags: amd64 apport-bug kubuntu ubiquity-2.21.63 xenial

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Title:
  Kubuntu 16.04 install crashes setting up encrypted partition

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