would be nice to have a “preset” or local file that can store a list of installed programs
so maybe we can back up this file and have an easy way to re-install programs on a fresh install
But not for Discover. In at least Arch the only thing Discover is good for are widgets and theme components.
apt list --installed
That would require some export/import functionality in Discover.
/var/log/apt/ would be more useful since it could be parsed to show stuff that you installed and exclude that stuff that came preinstalled.
of course both flapak and snap have their list functions as well
gear lever could possibly make some kind of appimage list , if it was used to “install” them.
And then repeat these steps for all the different distro packaging system backends.
Then do it again for Flatpak. And for Snaps.
Oh, yeah, also the plasma addons from the KDE store… 
dpkg --get-selections and --get-selections is more likely for Debian/*buntu, as it is amenable for this sort of scripting or programming task.
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