Installer crashes 18.04 64 bit

[AceKing]

When starting the installer from USB, or DVD, it crashes

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: ubiquity 18.04.2
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
CasperVersion: 1.388
CurrentDesktop: KDE
Date: Fri Mar 2 13:42:47 2018
InstallCmdLine: file=/cdrom/preseed/kubuntu.seed boot=casper maybe-ubiquity initrd=/casper/initrd.lz quiet splash --- maybe-ubiquity
LiveMediaBuild: Kubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64 (20180301)
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Launchpad Janitor (janitor)]

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

[AceKing (acviper)]

I was able to install by updating the installer before installation. In the update manager, I unchecked all updates except for the installer. Clicking on the installer after update worked for me.

[Kevin (cylon6)]

I have the same bug in Ubuntu (with GNOME). Updating before installing didn't help.

[Kevin (cylon6)]

Some additional info. I finally managed to install Ubuntu by setting the display scale in GNOME to 100%. It's a HiDPI screen and it defaults to 200% before installing.

I don't know where the problem exactly lies, because Fedora (with Gnome) installed fine.