Setting Custom Resolution Doesn't Work (Virtualmachine)

[Harley A.W. Lorenzo]

Setting the screen resolution explicitly from anything instead of the default 800x600 resolution while Disco Kubuntu is booted from a virtual-machine (Virtualbox) is met with the resolution switching quickly to what's expected followed by it immediately switching back to 800x600. Testing this in GNOME afterward is not met with this bug.

==== Guest Additions (proprietary) testing ====
(This utilizes the proprietary guest addition add-ons from Virtualbox to further test the limits of the bug, but since the guest additions are proprietary additions to the operating system, I am separating it.)

With Guest Additions installed, Plasma is able to stay with the auto-scaled resolution correctly, but setting any specific resolution is met with it switching back to the auto-scaled resolution much like how it would switch back to 800x600 earlier. GNOME is still able to switch to other resolutions without any problem with Guest Additions installed.
==== ====

I am unable to test if this bug affects actual real machines and hardware or if it is a virtual monitor specific bug.

I was using the KDE Displays settings GUI (kcmshell5 kcm_screen) while encountering this bug.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: kde-cli-tools 4:5.15.4-0ubuntu1
ProcVersionSignature: Ubuntu 5.0.0-8.9-generic 5.0.1
Uname: Linux 5.0.0-8-generic x86_64
ApportVersion: 2.20.10-0ubuntu25
Architecture: amd64
CurrentDesktop: KDE
Date: Mon Apr 8 01:58:23 2019
ExecutablePath: /usr/bin/kcmshell5
InstallationDate: Installed on 2019-04-08 (0 days ago)
InstallationMedia: Kubuntu 19.04 "Disco Dingo" - Alpha amd64 (20190326.1)
ProcEnviron:
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: kde-cli-tools
UpgradeStatus: No upgrade log present (probably fresh install)

[Scarlett Gately Moore (scarlettmoore)]

This bug is very old, if it is still an issue please update the bug with information from a supported release.

[Launchpad Janitor (janitor)]

[Expired for kde-cli-tools (Ubuntu) because there has been no activity for 60 days.]