Apparently this is gnome-bug https://bugzilla.gnome.org/show_bug.cgi?id=780348 that was supposedly fixed six days ago by commit ace15f5dceaa1691f9aee21f960c281e8c4d9fcc, but the behaviour is still happening as of today.
** Bug watch added: GNOME Bug Tracker #780348 https://bugzilla.gnome.org/show_bug.cgi?id=780348 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-settings-daemon in Ubuntu. https://bugs.launchpad.net/bugs/1676431 Title: Calculator key doesn't launch the calculator Status in gnome-settings-daemon package in Ubuntu: Confirmed Bug description: Calculator key doesn't launch the calculator in Zesty To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1676431/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp