If you want to install Ubuntu in VirtualBox on your Windows 11 computer, make sure to enable Hardware Virtualization from BIOS and then follow this guide.

Kubuntu is an official, lightweight Ubuntu-based Linux distribution. If you want to try Kubuntu on VirtualBox in Windows 11/10, follow this guide.

VirtualBox is a general-purpose full virtualizer for x86 hardware. Targeted at server, desktop and embedded use, it is a professional-quality virtualization solution that is also Open Source Software.

For those times when you absolutely must still run Windows XP, one safer way of doing it is to run XP in a virtual machine using the Oracle VirtualBox hypervisor on Linux Mint.