installer crashed

[li0n]

Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_ui.py", line 1068, in on_next_clicked
    self.dbfilter.ok_handler()
  File "/usr/lib/ubiquity/plugins/ubi-prepare.py", line 344, in ok_handler
    secureboot_key = self.ui.get_secureboot_key()
AttributeError: 'PageKde' object has no attribute 'get_secureboot_key'

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: 2.19.3-0ubuntu3
Architecture: amd64
CasperVersion: 1.366
CurrentDesktop: KDE
Date: Sat Jan 16 05:26:41 2016
InstallCmdLine: file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Kubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160115)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[Mélodie (meets)]

Hi,
I don't have logs to show you but here is a picture: http://pix.toile-libre.org/?img=1454975938.png