The translucent top bar is a feature of gnome-shell 3.25, but your bug report shows your system is still running 3.24. Try just updating your system. If that doesn't work then you will need to find out why you're not getting gnome-shell 3.25 already. Perhaps it's something to do with old Ubuntu Gnome metapackages?...
** Changed in: gnome-shell (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1715671 Title: top bar not translucent To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-shell/+bug/1715671/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs