Crap. I just realized that my somewhat long message never went through. Resending:
It looks like Debian testing introduces a plugin[1] for Snap integration, which Ubuntu has included[2] since 17.10. If this means that Ubuntu has removed Snap integration from gnome-software itself, then p erhaps this will not be an issue in Ubuntu 18.04/Trisquel 9. In the meantime, I was interested to see what would happen if I installed gnome-software without libsnapd-glib1, so I modified the deb package to no longer require libsnapd-glib1 and installed. $ apt download gnome-software $ tar x gnome-software_3.20.5-0ubuntu0.16.04.11_amd64.deb $ tar -xzf control.tar.gz $ sed -e s/"libsnapd-glib1 (>= 0.9), "//g -i control $ tar -cvzf control.tar.gz control $ ar rcs newpackage.deb debian-binary control.tar.gz data.tar.xz $ sudo apt install libappstream-glib8 libfwupd1 libgtkspell3-3-0 $ sudo dpkg -i newpackage.deb gnome-software was successfully installed. Upon launching it, I found that it no longer recommends proprietary software as it did before libsnapd-glib1 was removed from the repo. However, it also does not display any software that has not already been installed. This bug has also appeared in Fedora[3] and Ubuntu[4]. If I recall correctly, prior to the removal of libsnapd-glib1 gnome-software only showed installed packages and Snap packages, so it could also be related to this[5]. None of the workarounds suggested in these threads worked for me. After messing around with packagekitd for a while I gave up. I also found many threads about gnome-software not displaying any programs at all, which is the problem I ran into with gnome-software when I tried Fedora. I tried some of those workarounds, even though it's a slightly different issue, and had no luck. TL;DR: If libsnapd-glib1 were removed as a dependency of gnome-software, then gnome-software would be installable again and no longer recommend proprietary software, but it would still not work do to another bug that seems to be from upstream. [1] https://packages.debian.org/buster/gnome-software-plugin-snap [2] https://packages.ubuntu.com/artful/gnome-software-plugin-snap [3] https://unix.stackexchange.com/questions/307983/gnome-software-packagekit-lists-only-installed-packages [4] https://bugs.launchpad.net/ubuntu/+source/gnome-software/+bug/1548933 [5] https://askubuntu.com/questions/1050694/the-gnome-software-center-shows-few-apps/1050938
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