I'm no longer seeing this in LibreOffice Witer 5.4.2.2 on Ubuntu 17.10. In that version the popup menus have moved to a new sidebar tab called Page, and this issue does not occur there.
So this is effectively fixed. I'm marking this bug report as Fix Released. ** Changed in: libreoffice (Ubuntu) Status: New => 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/1644848 Title: in Writer, Page sidebar menus have unreadable text on dark background To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1644848/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs