Other people are reporting similar problems with WSL 2 and VirtualBox, e.g.

So it looks like that WSL 2 currently cannot coexist with VirtualBox, at least not with the current version 6.1.12 which I am using. The problem manifests itself in very slow performance, core dumps and screen staying black after booting e.g. Installing 'Windows Hypervisor Platform' as mentioned by did not change anything for me. If you want to use WSL 2, you need to install the 'Virtual Machine Platform' feature - but as soon as you do that, VirtualBox does not work properly any more.

This is a duplicate of #536, but that issue is closed and I see no way to reopen it. Worse yet, the only way I could manage to get VB working again was to restore to before installation of WSL2 and reinstall ('Repair') VirtualBox. This happens despite the VM being configured to use HyperV and with HyperV enabled in Windows Features. Running Windows 10 version 2004 and VirtualBox 6.1, enabling WSL2 causes Ubuntu/VB to boot to a blank rectangular screen with rapidly blinking cursor. This lets applications use the Hyper-V architecture for their emulation such as the Google Android Emulator, and VirtualBox 6 and above which are both now compatible with Hyper-V.

Install ubuntu on virtualbox windows 11