The Feature Freeze stage means that no major new features will be implemented in Ubuntu 21.04 until the final release hits the streets in late April 2021.
Developers will now focus their efforts on fixing important blockers that won’t delay the final release. Dubbed as “Hirsute Hippo,” Ubuntu 21.04 has been in development since late October 2020, shortly after the release of Ubuntu 20.10 (Groovy Gorilla). As its customary, the Feature Freeze stage will be followed shortly by an optional “Ubuntu Testing Week,” which will take place between March 4-11 and intended for those who want to help with the testing.