I think you can ignore that message. The binary package 'ubuntu-themes' doesn't really exist as it is replaced by 'light-themes'.
That said, the file you said you changed (/usr/share/themes/Ambiance/gtk-2.0/gtkrc) belongs to the light-themes package. Please try: 1. Forcefully reinstalling that package: sudo apt-get install --reinstall light-themes 2. Reboot 3. If the bug still isn't solved then take a photo of the problem for us and attach it here. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1743710 Title: Ubuntu 16.04: since 2018 all dropdown menus black and unreadable To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-themes/+bug/1743710/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
