systemd SEGV freezing on install of virtualbox

[kinghat]

most of the information has been reported at VBox here: https://forums.virtualbox.org/viewtopic.php?f=7&t=90643

when installing VBox this happens:
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sudo ./VirtualBox-5.2.23-126798-Linux_amd64.run
[sudo] password for kinghat:
Verifying archive integrity... All good.
Uncompressing VirtualBox for Linux installation.............
VirtualBox Version 5.2.23 r126798 (2018-11-20T16:12:47Z) installer
Installing VirtualBox to /opt/VirtualBox
Python found: python, installing bindings...

Broadcast message from systemd-journald@kinghat-kubuntu (Thu 2018-12-06 16:33:50 CST):

systemd[1]: Caught <SEGV>, dumped core as pid 5201.

Broadcast message from systemd-journald@kinghat-kubuntu (Thu 2018-12-06 16:33:50 CST):

systemd[1]: Freezing execution.

Failed to enable unit: Failed to activate service 'org.freedesktop.systemd1': timed out (service_start_timeout=25000ms)
Failed to enable unit: Failed to activate service 'org.freedesktop.systemd1': timed out (service_start_timeout=25000ms)
Failed to enable unit: Failed to activate service 'org.freedesktop.systemd1': timed out (service_start_timeout=25000ms)
Failed to enable unit: Connection timed out
Failed to start vboxdrv.service: Failed to activate service 'org.freedesktop.systemd1': timed out (service_start_timeout=25000ms)
See system logs and 'systemctl status vboxdrv.service' for details.
Failed to start vboxballoonctrl-service.service: Connection timed out
See system logs and 'systemctl status vboxballoonctrl-service.service' for details.
Failed to start vboxautostart-service.service: Connection timed out
See system logs and 'systemctl status vboxautostart-service.service' for details.
Failed to start vboxweb-service.service: Connection timed out
See system logs and 'systemctl status vboxweb-service.service' for details.

VirtualBox has been installed successfully.

You will find useful information about using VirtualBox in the user manual
  /opt/VirtualBox/UserManual.pdf
and in the user FAQ
  http://www.virtualbox.org/wiki/User_FAQ

We hope that you enjoy using VirtualBox.
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VB then starts fine. after reboot none of the VMs fail to launch. ive had weird install issues with VBox on 18.10 for many months.

Description: Ubuntu 18.10
Release: 18.10

VirtualBox-5.2.23-126798-Linux_amd64.run

http://paste.debian.net/hidden/ee22b12a/

ProblemType: Bug
DistroRelease: Ubuntu 18.10
Package: virtualbox (not installed)
ProcVersionSignature: Ubuntu 4.18.0-12.13-generic 4.18.17
Uname: Linux 4.18.0-12-generic x86_64
ApportVersion: 2.20.10-0ubuntu13.1
Architecture: amd64
CurrentDesktop: KDE
Date: Thu Dec 6 17:21:15 2018
InstallationDate: Installed on 2018-08-20 (108 days ago)
InstallationMedia: Kubuntu 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725)
SourcePackage: virtualbox
UpgradeStatus: Upgraded to cosmic on 2018-10-10 (57 days ago)

[Gordon Lack (gordon-lack)]

Happens to me to.

First seen when trying to install 5.2.22.
I abandoned that, cleared things up and re-installed 5.2.20 - which worked OK.

I've just tried installing 6.0.3-BETA3. That suffered this issue too.
I cleared things up (didn't wait for the install to "finish") and tried re-installing 5.2.20. This is also now suffering this issue.