For the record, I get the same symptoms as reported upstream - gphoto2
fails with:

1.801756 ptp2/usbread(2): Clearing halt on IN EP and retrying once.
1.802082 gphoto2-port(2): Clear halt...
1.802348 ptp2/usb_getresp(0): request code 0x1002 getting resp error 0x02ff
1.802558 ptp2/camera_init(0): ptp_opensession returns 2ff
1.802809 ptp2/device_reset_request(2): sending reset
1.803009 gphoto2-port(2): Writing message (request=0x66 value=0x0 index=0x0 
size=0=0x0)...
1.803218 gphoto2-port(3): No hexdump (NULL buffer)
1.807272 ptp(2): PTP: Opening session
1.807557 gphoto2-port(2): Writing 16=0x10 bytes to port...
1.807761 gphoto2-port(3): Hexdump of 16 = 0x10 bytes follows:
0000  10 00 00 00 01 00 02 10-00 00 00 00 01 00 00 00  ................

1.808007 ptp2/ptp_usb_getresp(2): reading response
1.808210 ptp2/ptp_usb_getpacket(2): getting next ptp packet
1.808411 gphoto2-port(2): Reading 512=0x200 bytes from port...

I have a Canon 60D, Ubuntu 12.04 on a ZAReason, USB 2, and dpkg:

ii  libusb-0.1-4                                  2:0.1.12-20                   
                       userspace USB programming library
ii  libusb-0.1-4:i386                             2:0.1.12-20                   
                       userspace USB programming library
ii  libusb-1.0-0                                  2:1.0.9~rc3-2ubuntu1          
                       userspace USB programming library
ii  gphoto2                                       2.4.11-2                      
                       The gphoto2 digital camera command-line client
ii  libgphoto2-2                                  2.4.13-1ubuntu1.2             
                       gphoto2 digital camera library
ii  libgphoto2-2:i386                             2.4.13-1ubuntu1.2             
                       gphoto2 digital camera library
ii  libgphoto2-l10n                               2.4.13-1ubuntu1.2             
                       gphoto2 digital camera library - localized messages
ii  libgphoto2-port0                              2.4.13-1ubuntu1.2             
                       gphoto2 digital camera port library
ii  libgphoto2-port0:i386                         2.4.13-1ubuntu1.2             
                       gphoto2 digital camera port library


** Tags added: precise

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https://bugs.launchpad.net/bugs/1094888

Title:
  GIMP: Could not mount Canon Digital Camera

Status in libgphoto:
  New
Status in “gimp” package in Ubuntu:
  Confirmed

Bug description:
  Objective: To access raw photo image files from my Canon 400D digital
  camera, using a USB connection.

  Result: GIMP (and UFRaw) produce the following error message:

            Could not mount Canon Digital Camera
            Error initialising camera: -1: Unspecified error

  To explain my route to this error within GIMP, I went to FIle -> Open
  -> Canon Digital Camera, at which point it then hangs, eventually
  producing the above error within a popup message.

  The exact same error is produced when trying to select the Canon
  Digital Camera when using UFRaw.

  (Related is the fact that the RawTherapee application crashes when
  trying to select the camera device using its own folder list.)

  I have searched for a solution of the above, but have only found that
  this problem may somehow be related to USB 3.0. If so, then this is a
  problem for me as I only have USB 3 (rather than USB 2) ports on my
  Asus UX31A.

  lsb_release -rd
  Description:  Ubuntu 12.10
  Release:      12.10

  (Note I am using XUBUNTU 12.10)

  apt-cache policy gimp
  gimp:
    Installed: 2.8.2-1ubuntu1.1
    Candidate: 2.8.2-1ubuntu1.1
    Version table:
   *** 2.8.2-1ubuntu1.1 0
          500 http://be.archive.ubuntu.com/ubuntu/ quantal-updates/main amd64 
Packages
          500 http://security.ubuntu.com/ubuntu/ quantal-security/main amd64 
Packages
          100 /var/lib/dpkg/status
       2.8.2-1ubuntu1 0
          500 http://be.archive.ubuntu.com/ubuntu/ quantal/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: gimp 2.8.2-1ubuntu1.1
  ProcVersionSignature: Ubuntu 3.5.0-21.32-generic 3.5.7.1
  Uname: Linux 3.5.0-21-generic x86_64
  ApportVersion: 2.6.1-0ubuntu9
  Architecture: amd64
  Date: Mon Dec 31 14:43:21 2012
  InstallationDate: Installed on 2012-12-12 (18 days ago)
  InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Release amd64 
(20121017.1)
  MarkForUpload: True
  SourcePackage: gimp
  UpgradeStatus: No upgrade log present (probably fresh install)

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