Please correct me if I'm wrong, but I believe the latest version of gtk2-engines that will be available in Ubuntu 18.04 LTS has been multi- archified.
https://launchpad.net/ubuntu/+source/gtk2-engines/1:2.20.2-4 ** Changed in: gtk2-engines (Ubuntu) Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/902128 Title: Please transition gtk engines to multiarch To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gtk2-engines/+bug/902128/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs