Because dolphin-dbg is not in the package repository (User Edition not LTS), I could not install dolphin-dbg because it depends on the ubuntu compiled version (4:15.12.3-0ubuntu1) and not on neon's compiled version (4:17.04.0-0neon+16.04+build23). TL;DR Add dolphin-dbg to package repository
The package is in the repos, its called "dolphin-dbgsym". For reference read this: https://wiki.ubuntu.com/Debug%20Symbol%20Packages#Getting_-dbgsym.ddeb_packages
Ok. Did not notice. L