Out of nowhere, each time I opened Nautilus it was showing hidden files by default.
If I used
Ctrl-H to hide them they went away. But next time I opened Nautilus, they were back. This was a global issue, not something goofy with a single folder. So the issue seemed to reside with Nautilus itself.
I found a way to correct it by using the
dconf-editor application. Open
dconf-editor (you may need to install it first, it isn’t a default part of Ubuntu 16.04) and navigate to
org, gtk, file-chooser and then uncheck the