It's not a GNOME bug. Ubuntu chose to use the GTK Icon Cache. For icons in /usr/share/icons a cache is generated/updated in the postinst. dh_iconcache used to do that, it's now dh_icons: https://wiki.ubuntu.com/UbuntuPackagingChanges#head-7a1029cb94855a96bf14f84ea79e9468febc7605
This package contains icons in /usr/share/icons/hicolor
It's not a GNOME bug. Ubuntu chose to use the GTK Icon Cache. For icons in /usr/share/icons a cache is generated/updated in the postinst. dh_iconcache used to do that, it's now dh_icons: https:/ /wiki.ubuntu. com/UbuntuPacka gingChanges# head-7a1029cb94 855a96bf14f84ea 79e9468febc7605
This package contains icons in /usr/share/ icons/hicolor