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

John Hupp lubuntu at prpcompany.com
Fri Sep 26 14:58:26 UTC 2014

This has the feel of the beginning of the kind of detour I want to avoid 
now, but OK, this much I have now done.  If they run with it and deliver 
a solution, it will be worthwhile.

On 9/25/2014 9:23 PM, Israel wrote:
> Hi John,
> It seems that this *may* be a bug in PCManFM.
> You might point the developers to this bug.
> Here is their mailing list:
> https://lists.sourceforge.net/lists/listinfo/pcmanfm-develop
> My reasoning is, if Shotwell can find it correctly, then the backend 
> MUST work (except the error -53)
> Unless the libfm backend doesn't work right...
> Either way, I think the pcmanfm devs will be able to fix this, and 
> would probably appreciate your report.  You are always very detailed 
> and very rigorous in your testing, and can give reliable tests to 
> reproduce this bug.
> On 09/25/2014 12:21 PM, John Hupp wrote:
>> New developments:
>> I dug up some old testing info from another problem and see that I 
>> was using
>> $ gvfs-mount -s gphoto2
>> to unmount gvfs filesystems (used for all cameras supporting the PTP 
>> standard for photo transfers)
>> But to use gvfs-mount, you have to first install gvfs-bin.
>> But in any case that now seems unnecessary.  Once in PCManFM, one can 
>> eject/unmount any of the filesystems displayed for the camera, and it 
>> will unmount all of them.  One of the displayed filesystems will 
>> disappear from PCManFM at that point, and the other one or two will 
>> remain displayed (thereby reflecting some status as recognized or 
>> available, but not mounted).  The camera is ready to be unplugged.
>> But there is still a lot of buggy behavior here.  Either by PCManFM, 
>> or perhaps by gvfs at the bottom of it.  Some problems:
>> - The Kodak EasyShare C182 error when plugged in: "Error initializing 
>> camera: -53: Could not claim the USB device."
>> - Multiple filesystems are represented.  Two for the Canon Powershot 
>> G1, both with matching contents.  Three for the Kodak EasyShare C182; 
>> some or all of the contents are duplicated.
>> - There is another error if you do not initially mount the camera 
>> storage in PCManFM, but say, in Shotwell, then close that and try to 
>> mount in PCManFM.  I didn't record the error but it duplicates reliably.
>> These bad behaviors are more troubling because opening PCManFM when 
>> plugging in a camera is the only option offered by default.  On 
>> account of that I hope someone has time to better define the bug(s) 
>> and pursue the problem.  (I've undertaken several of these 
>> mis/adventures.  It is sometimes a long road, and now would be a bad 
>> time for me take a big detour.)
>> That reference to Shotwell brings me to another point.
>> ------------------------------------------------------------------------
>> Looking for a less troubling and confusing user experience, I found 
>> it reported that Shotwell is the default photo manager for Ubuntu 
>> 14.04.  It's available via Synaptic and only installs a few small 
>> dependencies.  Total download was 12.5 MB as I recall.
>> 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 
>> Error -53 popup to OK through.)
>> 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.
>> That's better!
>> ------------------------------------------------------------------------
>> All the same, I hope someone pursues and fixes this.  I prefer 
>> Lubuntu's initial default of using PCManFM for camera downloads -- 
>> it's just not working well now.
>> --John
>> On 9/23/2014 10:18 PM, Israel wrote:
>>> Hi John!
>>> I would check out some of the documentation on the gvfs...
>>> However you can try
>>> gvfs-mount --unmount /<location>/
>>> where <location> is the actual location.
>>> You can also use
>>> gvfs-mount -o
>>> to watch what it is dong when you plug it in.
>>> (it monitors the output)
>>> man gvfs-mount
>>> will give you more information.
>>> You can also type
>>> man gvfs<TAB><TAB>
>>> (Use the actual TAB key) to see all the gvfs related commands listed.
>>> This should at least get you pointed in the right direction
>>> On 09/23/2014 05:29 PM, John Hupp wrote:
>>>> I plugged a Kodak EasyShare C182 (supporting PTP file transfer) 
>>>> into a 14.04.1 desktop today over USB and it responded with:
>>>> "Error initializing camera: -53: Could not claim the USB device"
>>>> OK'ing out of that, it then offered to open the device in the file 
>>>> manager, where it had mounted 3 devices.  One with no contents, 
>>>> another with DCIM and MISC folders, and another with 
>>>> something-store1 and something-store2 folders.  (I suppose there 
>>>> would be separate devices for internal memory and an SD card, but I 
>>>> don't know why there would be 3 devices.)
>>>> It was then only possible to unmount 1 of the 3 devices.  To 
>>>> prevent corruption, I powered down the PC before unplugging the camera.
>>>> Under 13.04, it responded:
>>>> "Error initializing camera: -60: Could not lock the device"
>>>> And then it opened in the file manager, again showing 3 devices, 
>>>> only one of which I could unmount, so again I powered down to 
>>>> disconnect.
>>>> ------------------------------------------------------------------------
>>>> 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 mounted 2 devices, both with DCIM and MISC 
>>>> folders.  I was only able to unmount one of the devices and so 
>>>> powered down to disconnect.
>>>> ------------------------------------------------------------------------
>>>> 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 this 
>>>> machine already has the prescribed libghoto2 update that should fix 
>>>> the described bug.
>>>> There is also this Launchpad Answer regarding error -53, but it 
>>>> does not mention the unmount 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 errors and the unmount problem are both troubling, but if I 
>>>> could find a manual unmount command (perhaps with gvfs?), at least 
>>>> I would have a workaround that would not involve rebooting.
>>>> Does anyone have the lowdown on all this?  What's the best 
>>>> available solution?
>>> -- 
>>> Regards
> -- 
> Regards

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