Is there a guide somewhere for the direct upgrade to 22.04?
Or it be posted somewhere?
I know that it has been a day from the release. 
The steps are the same as normal ubuntu:
Type in update-manager -d in a terminal, then the software updater will open and notify you about an upgrade to 22.04. Click upgrade and follow the instructions.
Release notes including upgrade instructions are on our website
and
FWIW, I upgraded my two-year old Lenovo laptop and all it is running fine. This laptop includes a LAMP server and other dev materials.