Merge pull request #2790 from armbian/AR-732

Unlock Hirsute

README.md

@@ -38,9 +38,12 @@ build tools</h3>
 ## What do you need to get started?
     
 - x64 machine with at least 2GB of memory and ~35GB of disk space for a VM, container or native OS,
-- Ubuntu Focal 20.04 x64 for native building or any [Docker](https://docs.armbian.com/Developer-Guide_Building-with-Docker/) capable x64 Linux for containerised,
+- Ubuntu Hirsute 21.04 x64 for native building or any [Docker](https://docs.armbian.com/Developer-Guide_Building-with-Docker/) capable x64 Linux for containerised,
+  - Hirsuite is required for newer non-LTS releases.. ex: Bullseye, Sid, Groovy, Hirsuite
+  - If building for LTS releases.. ex: focal, bionic, buster, It is possible to use Ubuntu 20.04 Focal, but is not supported.
 - superuser rights (configured sudo or root access).
 
+
 <p align=right><a href=#table-of-contents>⇧</a></p>
 
 ## How to build an image or a kernel?

config/distributions/hirsute/support

@@ -1 +1 @@
-csc
+supported

config/templates/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:20.04
+FROM ubuntu:21.04
 ARG DEBIAN_FRONTEND=noninteractive
 RUN apt-get update \
     && apt-get install -y --no-install-recommends \