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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Packages, which is subscribed to thunderbird in Ubuntu.
https://bugs.launchpad.net/bugs/1682455
Title:
thunderbird not available in GNOME Software
Status in thunderbird package in Ubuntu:
Invalid
Bug description:
I am filing this against Thunderbird, even though it also concerns
another package (GNOME Software).
Essentially, using a freshly installed Ubuntu GNOME 17.04, Thunderbird
is not available in GNOME Software (the default software app for this
flavour). You cannot find it via search or the packages browser.
The only way to install it is via apt-get and even then it doesn't
show in Software (see attached picture).
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/thunderbird/+bug/1682455/+subscriptions
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