MintInstall: low resolution detected (768px height), limiting window height. Launching app with Popen: /usr/bin/flatpak run --branch=stable --arch=x86_64 --command=com.github.tchx84.Flatseal ...

So I did a clean install on an old Acer aspire 7750 that has run many versions of Linux Mint (THANKS!) After the install, many updates and a bit of cleanup, I tried running the software-manager.