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.
** Changed in: thunderbird (Ubuntu)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1682455
Title:
thunderbird not available in GNOME Software
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