VirtualBox 6.0 crashes on Ubuntu 18.10

[kipc]

VirtualBox 6.0 crashes immediately after launching on fresh Ubuntu 18.10 host (ASUS N551JW laptop)

$ virtualbox
Gdk-Message: 21:32:35.060: VirtualBox: Fatal IO error 2 (No such file or directory) on X server :0.

$ sudo virtualbox
Qt WARNING: QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
Qt WARNING: QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-root'
Qt WARNING: The X11 connection broke: Maximum allowed requested length exceeded (code 4)
XIO:  fatal IO error 2 (No such file or directory) on X server ":0"
      after 612 requests (612 known processed) with 0 events remaining.

My installation process:

wget -q https://www.virtualbox.org/download/oracle_vbox_2016.asc -O- | sudo apt-key add -
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
sudo add-apt-repository "deb [arch=amd64] http://download.virtualbox.org/virtualbox/debian $(lsb_release -cs) contrib"
sudo apt-get update
sudo apt-get install virtualbox-6.0 -y

[kipc]

VBoxBugReport

[kipc]

I'm not the only one having this issue: ​https://forums.virtualbox.org/viewtopic.php?f=7&t=90934

[Socratis]

You don't have the same issue as the reporter on the forum thread. Different error message. Let's stick to the forums, no need to analyze the situation here...

[kipc]

I've found the cause...

It works normally after unplugging HDMI cable connected to a TV