Penguins Are Surfing On Your Switch Now With Full Audio, Graphics, Docking! - All tho you need a dedicated SDCard for it.
L4T Ubuntu is a version of linux based on nvidia's linux for tegra project. It uses a different kernel compared to previous releases which allows it to use features not yet in mainline. Such as audio, docking support and vulkan.
Downloads: Sdcard image: https://download.switchroot.org/switchroot-l4t-ubuntu-2019-04-28.img.gz
Sources: They can all be found at https://gitlab.com/switchroot with the other kernel repos on http://nv-tegra.nvidia.com
NEWS SOURCE: L4T Ubuntu - A fully featured linux on your switch (via) GBATemp