This strikes me as a bit chaotic, but I'm new to Ubuntu. I want to have the option to restore open apps when I shut down or logout of Ubuntu 20.04. As usual, I did a search, and found two articles that said basically the same thing: "use dconf-tools for this" (HTG article, LinOxide article).
Attempting to install this tool with apt, I learn that the dconf-tools package is not available. OK - so something's there to replace it - right? "Maybe not" is the answer here; the author of that answer indicates it "never worked well"? It was also suggested that Window Session Manager was good & well-maintained... but then he also said the entire concept never worked well?! Another Q&A suggested that dconf-tools had a replacement in dconf-cli - except that was for use as a dependency in another package, so...?
Also - quick search through the Ubuntu Software app shows there is an app called Dconf Editor, but its description is so terse as to be useless.
Since I've not seen anything for 20.04, I thought it was worth asking the question again: How to restore open windows and apps from my last session? Or, what has replaced dconf-tools?