You get a virtual machine, so you can build and run untrusted software. If you have very specific old software (for example, something that runs on Ubuntu 12.04

You get a virtual machine, so you can build and run untrusted software. If you have very specific old software (for example, something that runs on Ubuntu 12.04 LTS), then you can install LXD inside a Multipass VM, and from LXD create a system container with Ubuntu 12.04. While Multipass supports LTS versions of Ubuntu and recent development versions of Ubuntu, with LXD you get container images for many more versions and other distributions. See the list at https://us.images.linuxcontainers.org/ https://us.images.linuxcontainers.org/