I want an easy way to run one or more ephermal Linux VMs in Ubuntu desktop, including the possibility to mount host directories into them in an efficient fashion. Those VMs should have the same CPU architecture and hardware features as the host, no need to emulate some foreign CPU or special hardware, and no GUI in the VMs. The intended use case is sandboxing and isolation for security and reproducability reason. To be used as a cheaper alternative to a remote cloud instance. Or as a more secure alternative to Docker/Podman containers, with possibility to install Docker or Podman in the VM, and run containers there without affecting the host or other VMs (it’s not feasible to nest containers in a secure manner without a proper VM).