I run VirtualBox v7.0.8 on an updated Windows 11 Home.
Ubuntu 22.04 simply declined to work once installed on a VM. Even the "guest Additions" CD did not run automatically. Once Guest Addition ran manually, the VM still refused to open reasonably quickly. I tried installing 22.04 twice and then switched to the next in line.
Ubuntu 23.04 simply worked out of the box, but it had issues supporting a 4K monitor. Trying to enlarge the desktop to the full size of a 4K monitor caused blackouts. It was solved by adding more Display memory and increasing general VM RAM.
Another glitch was that moving a window over a desktop left visual traces - copies of the same window that were living in the background forever. This issue was gone by switching "3D Acceleration" off.
The VBox's VM settings look this way:
KVM Acceleration is selected for Linux guest
Display needs maximum RAM while "3D Acceleration" is better kept off
And the disk is marked as SSD
And yet, switching off "Virtual Machine Platform" feature in Control Panel -> Programs and Features + Restart probably was one single game changer, speeding up the VM a few times.
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