Comparing Linux Package Formats - Deb, Flatpak, AppImage, etc.
LBRY: https://beta.lbry.tv/comparing-linux-package-formats-deb
YouTube: https://www.youtube.com/watch?v=7fPShv-8Z_4
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I didn't like appimages before, but your use case for using them to run old software made me think they are useful on that way and valid. I just wish there was another way to do it, and that don't require some kind of virtualization