So far only versions with long-term support are available
Although Ubuntu is one of the most popular distributions for the Linux subsystem, Canonical has only provided Long-Term Support (LTS) versions for Windows 10 so far. The latest build for the WSL2 is an LTS version of Ubuntu 20.04 released in April 2020. Experimental versions, however, have not existed so far.
Canonical hat eine Community Preview…
… provided for the WSL2