Hi All,
Did a few more tests.
Using personal test list, "Lubuntu - Additional things to test for".
* Installed HP LaserJet.
* Went OK but got a "Sorry, Ubuntu 17.04 has experienced an internal error" /usr/share/hplip/systray.py
* Installed LibreOffice. Opening a .odt file runs AbiWord. Shouldn't it run Writer?
I've attached my personal test list as a PDF, in case someone is interested.