I am filing this against Thunderbird, even though it concerns another package (Gnome Software).
Essentially, using a freshly installed Ubuntu GNOME 17.04, Thunderbird is not available in GNOME Software. 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).
I am filing this against Thunderbird, even though it concerns another package (Gnome Software).
Essentially, using a freshly installed Ubuntu GNOME 17.04, Thunderbird is not available in GNOME Software. 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).