If you followed my last, hastily written, explanatory post HERE, you probably thought that I was a little crazy, trying to update an existing Xubuntu 17.04 system to the new release of Debian, 9.0 named “Stretch”. Well, I followed the instructions that I posted there from start to finish, and the results are: [drum roll – your fingers on your desk will do] it… took a real long time. And some issues were faced after upgrade when using sudo aptitude upgrade -y followed by sudo aptitude -f install. What happened, is they pretty much switched back and forth. Upgrade thought that Debian packages took precedence. -f install thought that Ubuntu, Lubuntu and Xubuntu packages took precedence. So each kept overwriting the changes made by the other.
So, just as a general warning, if you try this and it works for you, -f install is pretty well useless from now on, unless you’re lucky and sudo aptitude upgrade –full-resolver works for you. For the record, I use “aptitude” for everything because it is able to find and to resolve conflicts, or to give choices as to how you want a conflict handled, except for autoremove which requires apt or apt-get.
Anyway, to make a long story short, the process worked, and all updating pulls from the correct places and correctly applies, but at this point, I’m unable to figure out, even after autoremove, clean and autoclean, how to restore my ability to use -f install. So I now have a working Debian 9 install with a few remnants of Ubuntu under the hood. It works fine, and is stable.