Currently update-desktop-database is only run when installing libreoffice-common. But libreoffice-{base,calc,draw,impress,math,writer} create additional desktop files as symlinks. Namcap fails to detect this as the target files are all owned by libreoffice-common:

libreoffice-writer E: Symlink (usr/share/applications/libreoffice-writer.desktop) points to non-existing /usr/lib/libreoffice/share/xdg/writer.desktop

Solution:
Create an additional install script which only executes "update-desktop-database -q" on post_{install,upgrade,remove} and use it in libreoffice-{base,calc,draw,impress,math,writer}.

Steps to reproduce:
Do a fresh install of libreoffice and try to open a document from a file browser. No application will be found to handle this.