Kubuntu installer fails to proceed past language selection

[Michael]

Unexpected error happens on latest Kubuntu 16.04 Daily Build installer, as of January the 7th of 2016

Ensuing error message reads:

Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_ui.py", line 492, in <lambda>
    0, lambda: self.dbfilter.start(auto_process=True))
  File "/usr/lib/ubiquity/ubiquity/filteredcommand.py", line 103, in start
    prep = self.prepare()
  File "/usr/lib/ubiquity/plugins/ubi-prepare.py", line 309, in prepare
    self.ui.set_using_secureboot(True)
AttributeError: 'PageKde' object has no attribute 'set_using_secureboot'

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: ubiquity 2.21.42
ProcVersionSignature: Ubuntu 4.3.0-5.16-generic 4.3.3
Uname: Linux 4.3.0-5-generic x86_64
ApportVersion: 2.19.3-0ubuntu2
Architecture: amd64
CasperVersion: 1.366
CurrentDesktop: KDE
Date: Thu Jan 7 22:03:17 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" - Alpha amd64 (20160107)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

This is the first time ever that I make a bug report. Feel free to ask me any more details or logs if needed.

[mrl586 (mrl586)]

It seems same bug as earlier but with slightly modified line numbers.
https://bugs.launchpad.net/ubuntu/+source/ubiquity/+bug/1529450

[Launchpad Janitor (janitor)]

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