Am 2017-09-21 23:21, schrieb Renaud (Ron) OLGIATI:
> My camera, cell phone and USB pendrives that used to mount without
> trouble under Debian now give an error "Not authorized" and I have to
> launch a Pcmanfm as root to access them.

I had similar issues some time ago and switched to spacefm with udevil.
That solved it for me.

Jochen