Kubuntu Installer crashed on 3-rd step in VirtualBox

[Ilya Smirnov]

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 2.21.43
ProcVersionSignature: Ubuntu 4.4.0-4.19-generic 4.4.1
Uname: Linux 4.4.0-4-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CasperVersion: 1.366
CurrentDesktop: KDE
Date: Wed Feb 17 13:45:26 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 (20160217)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Flames_in_Paradise (ellisistfroh-deactivatedaccount)]

Thank you for taking the time to report this bug and helping to make
Ubuntu better.

This particular bug has already been reported and is a duplicate of bug
#1529450, so it is being marked as such. Please look at the other bug
report to see if there is any missing information that you can provide,
or to see if there is a workaround for the bug.

Additionally, any further discussion regarding the bug should occur in the other report.

Please feel free to continue to report any other bugs you may find.

[Ilya Smirnov (smirnovist)]

OK, thanks!