And it is also working just fine here as well.
Upgrading from LM21 to LM21.1 can be done either by opening the update manager and click on edit.....then choose 'upgrade to lm21.1...
or via system reports and follow the prompts there.
The process is almost exactly the same as installing normal, everyday updates.
It would still be wise to take a Timeshift snapshot Before upgrading.
I also took another snapshot After upgrading
i prefer to err on the side of caution.
Having said that, I sat and drank a cuppa during the process, and the upgrade finished as I finished the cuppa.
Rebooted and all is well.