Device Notifier is definitely broken. Sometimes it works fine, but for unknown reason -
every once a while it falls back to reporting the "Mallformed URL" erratic
error. It doesn't seem to be USB device dependent. When it is misbehaving - it is
doing so for all devices which it was mounting properly and launching in Dolphin before.
There is also another error: once a device is mounted, there is no more option "Open
with File Manger", instead there is a message: "You are not authorized to mount
Env: fc24, KDE destkop spin,
Linux xxx 4.7.2-201.fc24.x86_64 #1 SMP Fri Aug 26 15:58:40 UTC 2016 x86_64 x86_64 x86_64