Comment 2 for bug 1682455

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Staš Kotarac Guček (skgucek) wrote : Re: thunderbird not available in GNOME Software

Solved it by removing the local cache of GNOME Software and forcing it to re-download its data

$ killall gnome-software
$ rm -r ~/.local/share/gnome-software

... et voilà, Thunderbird magically appeared in the software catalogue.