Comment 13 for bug 1400626

The new xorg/mesa packages should, but don't, have a "Provides: <name-of-package-being-replaced>" field in the Debian control file, to avoid breaking other installed packages which depend on the older xorg/mesa packages by name; for example, the lib-gl1-mesa-glx-lts-utopic package's control file should contain "Provides: lib-gl1-mesa-glx".