First, the files winehq.key and ubuntu-wine-ubuntu-ppa-bionic.list.backup have no place in /etc/apt/sources.list.d/. The .key files can be safely deleted after adding them. Read more about the apt folders here.
Second, the instructions on the winehq site are incomplete as they themselves admit it:
So, use the instructions from here to add a new repository ...
This should be the official page.
I found packages support up to xUbuntu 20.04, also can be gotten from repository.
It is found in the following page with introduction and setup guide.
Albert is a good Spotlight alternative ...
I also couldn't make Albert work and also learned that it doesn't have nearly as much features as on macOS.
I finally figured out how to make Albert work.
Remove Albert - only if you already tried installing Albert (First startup of Albert crashed on my system and broke the install)
sudo apt-get remove albert
sudo rm -rf /usr/bin/albert
You can try to recompile the app, it doesn't call "System Setting", the app name is Switchboard, so just go to the Elementary OS github and check the repo of this app (https://github.com/elementary/switchboard ),
1) Download the repo
2) Install all the libraries and dependencies
3) Compile the project with vala and ninja
4) DONE ! :D