"The indexer cannot find packages when there is a main artifact with the same name: If the artifacts are named like:
nexus-apt-plugin-0.5.jar
nexus-apt-plugin-0.5.deb
The indexer won't index the debian package. In order to make the indexer index the debian package it needs a classifier:
nexus-apt-plugin-0.5.jar
nexus-apt-plugin-0.5-all.deb
This is fine."
The realization was that the *pom* file is an artifact with the same name... so the patch 2426 adds a classifier in the 'deb' case. Once that was done the indexer started working.