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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1676431 Title: Calculator key doesn't launch the calculator To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1676431/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs