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Flatsweep Cleans Leftover Data from Uninstalled Flatpaks - OMG! Linux
(www.omglinux.com)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
This community's icon was made by Aaron Schneider, under the CC-BY-NC-SA 4.0 license.
The check for if a package is installed can be simplified using
flatpak info
.