In Xenial virtual machine installed .20 from proposed, did
---> ua detach --assume-yes apt update apt upgrade apt install hello update-manager <---
and confirmed that update-manager just says "The software on this computer is up to date. However, Ubuntu 18.04.6 LTS is now available (you have 16.04)."
In Xenial virtual machine installed .20 from proposed, did
--->
ua detach --assume-yes
apt update
apt upgrade
apt install hello
update-manager
<---
and confirmed that update-manager just says "The software on this computer is up to date. However, Ubuntu 18.04.6 LTS is now available (you have 16.04)."