I had a similar problem show up on Lubuntu 16.04 (i386). One thing that
SEEMS to work (it actually made a Samsung phone reboot!) is

1) disable the "USB debugging" on the phone;
2) set the phone to Airplane mode (so it doesn't try to make a network 
connection).

In my case, running `dmesg` it seems that Network Manager was trying to set a 
network connection:
[ 1039.598665] cdc_acm 1-3:1.1: ttyACM0: USB ACM device

HTH.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gvfs in Ubuntu.
https://bugs.launchpad.net/bugs/1314556

Title:
  Unable to mount Android MTP device

Status in gvfs package in Ubuntu:
  Confirmed

Bug description:
  I have the same problem on 3 computers with 14.04:

  So I tried,
   mtp-detect 
  Unable to open ~/.mtpz-data for reading, MTPZ disabled.libmtp version: 1.1.6

  Listing raw device(s)
  Device 0 (VID=04e8 and PID=6860) is a Samsung Galaxy models (MTP).
     Found 1 device(s):
     Samsung: Galaxy models (MTP) (04e8:6860) @ bus 1, dev 10
  Attempting to connect device(s)
  ignoring libusb_claim_interface() = -6PTP_ERROR_IO: failed to open session, 
trying again after resetting USB interface
  LIBMTP libusb: Attempt to reset device
  inep: usb_get_endpoint_status(): Resource temporarily unavailable
  outep: usb_get_endpoint_status(): Device or resource busy
  ignoring libusb_claim_interface() = -6LIBMTP PANIC: failed to open session on 
second attempt
  Unable to open raw device 0
  OK.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: gvfs-backends 1.20.1-1ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Apr 30 11:18:12 2014
  EcryptfsInUse: Yes
  ExecutablePath: /usr/lib/gvfs/gvfs-mtp-volume-monitor
  InstallationDate: Installed on 2013-02-12 (441 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  ProcEnviron:
   XDG_RUNTIME_DIR=<set>
   SHELL=/bin/bash
   LANGUAGE=en_US
   PATH=(custom, user)
   LANG=en_US.UTF-8
  SourcePackage: gvfs
  UpgradeStatus: Upgraded to trusty on 2014-04-02 (27 days ago)

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