[Pcmanfm-develop] Plug in PTP camera: "Error initializing camera: -53" and multiple filesystems shown

[John H. <pc...@pr...>]

Israel on the Lubuntu users list urged me to bring my observations 
here.  So:

Plugging a Kodak EasyShare C182 (supporting PTP file transfer) into a 
Lubuntu 14.04.1 desktop over USB, it responds with:

"Error initializing camera: -53: Could not claim the USB device"

OK'ing out of that, it then offers to open the device in the file 
manager, where it mounts 3 filesystems.  One with no contents, another 
with DCIM and MISC folders, and another with something-store1 and 
something-store2 folders.  I have not tested rigorously, but it seems 
that the actual file collections are duplicates.

If I then unmount one of the filesystems, it disappears, and the other 
two remain visible but not mounted.  They disappear when I power off and 
unplug the camera.

For comparison, under 13.04, the same camera responded:

"Error initializing camera: -60: Could not lock the device"

And then it opened in the file manager, again showing 3 filesystems as 
above.

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For a partial comparison, I plugged a Canon Powershot G1 into the 
14.04.1 desktop and there was no error, it offered to open in file 
manager, and it showed 2 mounted filesystems, both with DCIM and MISC 
folders and duplicate file collections.  If I unmount one of the 
instances it disappears and and the other remains visible but 
unmounted.  That disappears when I power off and unplug the camera.

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Searching for non-ancient explanations (of which there are many), I did 
find this popular bug:

PTP Cameras not working on 14.04, works flawlessly on 12.04 
<https://bugs.launchpad.net/ubuntu/+source/gvfs/+bug/1296275>

But that report does not reference either of these errors, and my 
machine already has the prescribed libghoto2 update that should fix the 
described bug.

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I installed Shotwell.  Now plugging in a camera results in Shotwell 
being offered alongside the file manager as choices to mount the 
storage.**  There is also a checkbox where one could choose to always 
use Shotwell instead of being offered the choice.

[**Though for the Kodak there is still the initial Error -53 popup to OK 
through.  I see this Launchpad Answer regarding error -53 and Shotwell, 
but it does not mention the multiple filesystems problem: Unable to 
fetch previews from the camera: Could not claim the USB device (-53) 
<https://answers.launchpad.net/ubuntu/+source/shotwell/+question/157569> ]

The Shotwell interface reasonably shows just one filesystem represented 
for either the Canon or the Kodak.  When one is done 
previewing/importing and closes Shotwell, it automatically unmounts the 
camera storage once again, and the camera can be unplugged.

------------------------------------------------------------------------

But after exiting Shotwell, if I then open PCManFM, I see just one, 
unmounted instance of the Canon (don't recall the Kodak behavior on this 
issue).  If I try to mount it, I get an error:

The name:1.30 was not provided by any .service files.  (And I can OK out 
of there, but it does not mount the storage.)