Hi Samuel,
The f25 to f26 upgrade was done using the instructions here:
"https://fedoraproject.org/wiki/DNF_system_upgrade".
The "post-upgrade tasks" are the ones in the "Optional post-upgrade
tasks" section and the "Resolving post-upgrade issues" section of those
instructions. I completed those today, along with "rkhunter --propupd".
The problem does seem to have fixed itself. The system does seem to be behaving better
today. For my (and others) education, please see the questions in my reply to Ed's
last post on this thread.
Thank-you.
Bill.