According to https://wiki.debian.org/AppStream/Guidelines#How_to_exclude_.desktop_files_from_the_metadata, all that's needed to fix this bug is to add the following entry to libreoffice-startcenter.desktop:
X-AppStream-Ignore=True -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1738821 Title: Appstream data points to libreoffice-common To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/libreoffice/+bug/1738821/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs