I got a Nokia Lumia 620 as a backup phone. I'd say I can mount my Nexus 4 reliably with Ubuntu via nautilus using gvfs-mtp. Users with Android devices like the Nexus 4 still get error messages on a regularly basis of the device not being able to mount, but replugging the device mostly fixes the issue.

However, the experience with the Lumia 620 is far worse (the desktop sometimes freezes) and the workaround I found to get the device to work is very crude.

The Lumia 620 itself was added to libmtp with this report: http://sourceforge.net/p/libmtp/bugs/780/

Bug Report on Launchpad: https://bugs.launchpad.net/ubuntu/+source/gvfs/+bug/1247572

I got no crashes today when walking through the steps below, but I still need to run mtp-detect to mount the internal storage and sd card.


## Steps to reproduce:

1. Reboot (or cold boot) computer and phone. Login to computers destop and unlock the phone by entering PIN.
2. Plug the phone via USB into the computer. (Cable works with Nexus 4 or another Android device.) The phone will give a signal that it is connected to the computer.
3. Try to open the phone in Nautilus. My desktop either freezes (cold boot) here or nautilus hangs (reboot).

3.a) If nautilus hangs: Open a terminal with Ctrl+Alt+T and kill nautilus with xkill.
3.b) If your desktop froze: Go to a virtual terminal with Ctrl+Alt+F1.
3.c) If you just get an error message: Open a terminal with Ctrl+Alt+T and go to step 4.

4. Execute 'mtp-detect' (from mtp-tools package) from terminal (either via Dektop or virtual terminal). If you get one of the following messages wait a few seconds and try again.

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

  Listing raw device(s)
  Device 0 (VID=0421 and PID=0661) is a Nokia Nokia Lumia WP8.
     Found 1 device(s):
     Nokia: Nokia Lumia WP8 (0421:0661) @ bus 2, dev 22
  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
  LIBMTP PANIC: failed to open session on second attempt
  Unable to open raw device 0
  OK.

---

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

  Listing raw device(s)
  Device 0 (VID=0421 and PID=0661) is a Nokia Nokia Lumia WP8.
     Found 1 device(s):
     Nokia: Nokia Lumia WP8 (0421:0661) @ bus 2, dev 22
  Attempting to connect device(s)
  PTP_ERROR_IO: failed to open session, trying again after resetting USB interface
  LIBMTP libusb: Attempt to reset device
  LIBMTP PANIC: failed to open session on second attempt
  Unable to open raw device 0
  OK.

---

Repeat this until you get a long list of scrolling text that ends with something similar to this:

  MTP-specific device properties:
     Friendly name: Windows Phone
     Synchronization partner: (NULL)
     Battery level 74 of 100 (74%)
  libmtp supported (playable) filetypes:
     Folder
     Text file
     ISO MPEG-1 Audio Layer 3
     Audio Video Interleave
     JPEG file
     Microsoft Windows Media Audio
     Advanced Audio Coding (AAC)/MPEG-2 Part 7/MPEG-4 Part 3
     Microsoft Windows Media Video
     Abstract Album file
     Abstract Playlist file
     GIF bitmap file
     JFIF file
     Portable Network Graphics
     TIFF bitmap file
     BMP bitmap file
     MPEG-4 Part 14 Container Format (Audio+Video Emphasis)
     MPEG-4 Part 14 Container Format (Audio Emphasis)
     DOC file
     XLS file
     PPT file
  OK.

---

5. Go to a virtual terminal and do 'sudo service lightdm restart'. Login again, you hear the phone reconnecting to your computer and should now be able to open your phone in nautilus seeing the phones internal storage and the SD card (if there is) als sub devices.

6. Unplug the phone from the computer and start with step 2 if you want to connect the phone again.

## Additional information

$ lsb_release -rd
Description: Ubuntu 13.10
Release: 13.10

$ apt-cache policy gvfs gvfs-backends mtp-tools
gvfs:
  Installed: 1.18.2-0ubuntu1
  Candidate: 1.18.2-0ubuntu1
  Version table:
 *** 1.18.2-0ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
        100 /var/lib/dpkg/status
gvfs-backends:
  Installed: 1.18.2-0ubuntu1
  Candidate: 1.18.2-0ubuntu1
  Version table:
 *** 1.18.2-0ubuntu1 0
        500 http://de.archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
        100 /var/lib/dpkg/status
mtp-tools:
  Installed: 1.1.6-2
  Candidate: 1.1.6-2
  Version table:
 *** 1.1.6-2 0
        500 http://de.archive.ubuntu.com/ubuntu/ saucy/universe amd64 Packages
        100 /var/lib/dpkg/status