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[Sebastien Bacher <seb128@xxxxxxxxxx>]

Thanks, that should be fixed in the current version

** Changed in: libmtp (Ubuntu)
   Importance: Undecided => High

** Changed in: libmtp (Ubuntu)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1374896

Title:
  Cannot mount HTC One m8 via MTP on Ubuntu 14.04

Status in libmtp package in Ubuntu:
  Fix Released

Bug description:
  I am unable to mount the filesystems on my HTC One m8 phone. It is an
  Android 4.x device, which only supports the Media Transfer Protocol
  for transferring files between the phone and a connected PC. USB Mass
  Storage is not supported.  My phone is the variant sold by T-Mobile
  USA.  When I use the "mtp-detect" program to connect, this message is
  printed at the begininng of the output:

      Unable to open ~/.mtpz-data for reading, MTPZ disabled.libmtp
  version: 1.1.6

      Listing raw device(s)
      Device 0 (VID=0bb4 and PID=0f25) is UNKNOWN.
      Please report this VID/PID and the device model to the libmtp development team
         Found 1 device(s):
         0bb4:0f25 @ bus 5, dev 17
      Attempting to connect device(s)

  ...so I am reporting this against libmtp, but there may be other
  related packages that are affected.  At one point, I saw a gvfs error
  message. This might be considered related to bug #1314556, although I
  suspect that many devices will run into problems when they are new.

  Linux in general needs very robust MTP support that is as forward-
  compatible with new hardware as possible, especially now that newer
  handsets no longer support the old USB Mass Storage method of
  transferring files.  It is not desirable to have new devices be
  unusable when they are released and have to wait 6 to 12 months for a
  new Ubuntu release before they start working, especially since many
  smartphones are only sold for a year or two before being replaced by
  new models.

  
  I use the XFCE desktop environment. I am able to get an "Android Phone" icon to appear on my desktop, but when I initially clicked on it, an error would occur and I'd be unable to mount the device.  After enabling USB Debugging on the phone (which is a hidden feature on this particular device, requiring using a simple "Easter egg" to expose the setting), I began to be able to double-click the "Android Phone" icon and then get a window with one icon for "Internal storage" and another for "SD card".  However, clicking on either of those results in an error dialog with the message:

      Unhandled error message: Unable to open MTP device '[usb:005,011]'

  
  [mike@3po][~]$ lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04
  [mike@3po][~]$ uname -a
  Linux 3po 3.13.0-35-generic #62-Ubuntu SMP Fri Aug 15 01:58:42 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
  [mike@3po][~]$ apt-cache policy libmtp9 mtp-tools
  libmtp9:
    Installed: 1.1.6-20-g1b9f164-1ubuntu2
    Candidate: 1.1.6-20-g1b9f164-1ubuntu2
    Version table:
   *** 1.1.6-20-g1b9f164-1ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status
  mtp-tools:
    Installed: 1.1.6-20-g1b9f164-1ubuntu2
    Candidate: 1.1.6-20-g1b9f164-1ubuntu2
    Version table:
   *** 1.1.6-20-g1b9f164-1ubuntu2 0
          500 http://us.archive.ubuntu.com/ubuntu/ trusty/universe amd64 Packages
          100 /var/lib/dpkg/status
  [mike@3po][~]$

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