I've updated gnome-software, gnome-software-common and gnome-software-plugin-snap to version 3.30.2-0ubuntu4 (only those packages, I left other available updates in the queue to be able to test the updated version)
It now shows no updates available in the updates tab, and a tick mark with the text Software is up to date in the main window.
(screenshot attached)
Thank you again for acting so quickly on this issue, I'm very impressed!
Thank you Robert Ancell and Steve Langasek.
Your patch fixed the issue.
I've updated gnome-software, gnome-software- common and gnome-software- plugin- snap to version 3.30.2-0ubuntu4 (only those packages, I left other available updates in the queue to be able to test the updated version)
It now shows no updates available in the updates tab, and a tick mark with the text Software is up to date in the main window.
(screenshot attached)
Thank you again for acting so quickly on this issue, I'm very impressed!