LXD or Incus is a Linux operating system-level container system. You can build over 25+ Linux distros for testing, fun, and profit. You can even run GUI apps inside those containers and get output displayed back to your X display easily. For example, you can run Firefox in one Linux container for banking needs with custom add-ons, including specific firewall rules just for allowing outgoing banking and nothing else. You can have another container to run Chromium/Edge/FF for social media. Of course, it is not a replacement for something like Qubes OS, but you can do many things in an isolated environment. You can try a new Linux distro without the VM's overheads and test new features offered by that distro. All Linux containers will share the same Linux kernel and hardware devices as your GPU. Here is a quick shell script to build a quick lab to test various Linux distros.
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