lubuntu 18.04.1 installer crashes every time in virtualbox

[theminertv]

I've tried to install Lubuntu 18.04.1 LTS Desktop 64bit in virtualbox for 4 times.
Every try I've generated a new 12 gigabyte vhd.
My virtual machine has 1 core, 1024 megabytes of memory, and 12 gigabytes of storage.
Happens when installing in default harddrive partition configuration, 'cuz I currently don't have the time to partition my drives.
I haven't tested it on a custom partioned vhd.

- TheDevMiner

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.14.6
ProcVersionSignature: Ubuntu 4.15.0-29.31-generic 4.15.18
Uname: Linux 4.15.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.2
Architecture: amd64
CasperVersion: 1.394
Date: Sun Dec 30 22:12:17 2018
InstallCmdLine: file=/cdrom/preseed/lubuntu.seed boot=casper only-ubiquity initrd=/casper/initrd.lz quiet splash --- debian-installer/language=de keyboard-configuration/layoutcode?=de
LiveMediaBuild: Lubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
ProcEnviron:
 LANGUAGE=de_DE.UTF-8
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=de_DE.UTF-8
 LC_NUMERIC=C.UTF-8
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)