I tried plugging in to two different USB ports, then repeatedly into
one. It finally took, so the problem is intermittent for me.

It turns out mtp-connect was hanging in a terminal window and I found a
lot of what might be useful debugging info when I went back to it (after
the successful mount):

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

Listing raw device(s)
Device 0 (VID=1004 and PID=62ce) is UNKNOWN.
Please report this VID/PID and the device model to the libmtp development team
   Found 1 device(s):
   1004:62ce @ bus 2, 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
Android device detected, assigning default bug flags
Error 7: Found a bad handle, trying to ignore it.
Error 7: Found a bad handle, trying to ignore it.
Error 7: Found a bad handle, trying to ignore it.
Error 7: Found a bad handle, trying to ignore it.
Error 7: Found a bad handle, trying to ignore it.
USB low-level info:
   bcdUSB: 512
   bDeviceClass: 0
   bDeviceSubClass: 0
   bDeviceProtocol: 0
   idVendor: 1004
   idProduct: 62ce
   IN endpoint maxpacket: 512 bytes
   OUT endpoint maxpacket: 512 bytes
   Raw device info:
      Bus location: 2
      Device number: 10
      Device entry info:
         Vendor: (null)
         Vendor id: 0x1004
         Product: (null)
         Vendor id: 0x62ce
         Device flags: 0x08008106
Configuration 0, interface 0, altsetting 0:
   Interface description contains the string "MTP"
   Device recognized as MTP, no further probing.
Device info:
   Manufacturer: LGE
   Model: VS990
   Device version: 1.0
   Serial number: VS9908c1542c8
   Vendor extension ID: 0x00000006
   Vendor extension description: microsoft.com: 1.0; android.com: 1.0;
   Detected object size: 64 bits
   Extensions:
        microsoft.com: 1.0
        android.com: 1.0
Supported operations:
   1001: get device info
   1002: Open session
   1003: Close session
   1004: Get storage IDs
   1005: Get storage info
   1006: Get number of objects
   1007: Get object handles
   1008: Get object info
   1009: Get object
   100a: Get thumbnail
   100b: Delete object
   100c: Send object info
   100d: Send object
   1014: Get device property description
   1015: Get device property value
   1016: Set device property value
   1017: Reset device property value
   101b: Get partial object
   9801: Get object properties supported
   9802: Get object property description
   9803: Get object property value
   9804: Set object property value
   9805: Get object property list
   9810: Get object references
   9811: Set object references
   95c1: Get Partial Object (64bit Offset)
   95c2: Send Partial Object
   95c3: Truncate Object
   95c4: Begin Edit Object
   95c5: End Edit Object
Events supported:
   0x4002
   0x4003
   0x4004
   0xd402: Friendly Device Name
   0x5003: Image Size
   0x5001: Battery Level
Playable File (Object) Types and Object Properties Supported:
   3000: Undefined Type
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   3001: Association/Directory
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   3004: Text
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   3005: HTML
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   3008: MS Wave
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc9b: Album Artist STRING data type READ ONLY
      dc8b: Track UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc99: Original Release Date STRING data type DATETIME FORM READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc8c: Genre STRING data type READ ONLY
      dc96: Composer STRING data type READ ONLY
      de99: Audio WAVE Codec UINT32 data type ANY 32BIT VALUE form READ ONLY
      de92: Bit Rate Type UINT16 data type enumeration: 1, 2,  READ ONLY
      de9a: Audio Bit Rate UINT32 data type range: MIN 1, MAX 1536000, STEP 1 
READ ONLY
      de94: Number Of Channels UINT16 data type enumeration: 1, 2, 3, 4, 5, 6, 
7, 8, 9,  READ ONLY
      de93: Sample Rate UINT32 data type range: MIN 8000, MAX 48000, STEP 1 
READ ONLY
   3009: MP3
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc9b: Album Artist STRING data type READ ONLY
      dc8b: Track UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc99: Original Release Date STRING data type DATETIME FORM READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc8c: Genre STRING data type READ ONLY
      dc96: Composer STRING data type READ ONLY
      de99: Audio WAVE Codec UINT32 data type ANY 32BIT VALUE form READ ONLY
      de92: Bit Rate Type UINT16 data type enumeration: 1, 2,  READ ONLY
      de9a: Audio Bit Rate UINT32 data type range: MIN 1, MAX 1536000, STEP 1 
READ ONLY
      de94: Number Of Channels UINT16 data type enumeration: 1, 2, 3, 4, 5, 6, 
7, 8, 9,  READ ONLY
      de93: Sample Rate UINT32 data type range: MIN 8000, MAX 48000, STEP 1 
READ ONLY
   300b: MPEG
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc48: Description STRING data type READ ONLY
      dc87: Width UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc88: Height UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc47: Date Authored STRING data type DATETIME FORM READ ONLY
   3801: JPEG
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc48: Description STRING data type READ ONLY
      dc87: Width UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc88: Height UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc47: Date Authored STRING data type DATETIME FORM READ ONLY
   3804: BMP
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc48: Description STRING data type READ ONLY
      dc87: Width UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc88: Height UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc47: Date Authored STRING data type DATETIME FORM READ ONLY
   3807: GIF
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc48: Description STRING data type READ ONLY
      dc87: Width UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc88: Height UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc47: Date Authored STRING data type DATETIME FORM READ ONLY
   380b: PNG
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc48: Description STRING data type READ ONLY
      dc87: Width UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc88: Height UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc47: Date Authored STRING data type DATETIME FORM READ ONLY
   b901: WMA
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc9b: Album Artist STRING data type READ ONLY
      dc8b: Track UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc99: Original Release Date STRING data type DATETIME FORM READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc8c: Genre STRING data type READ ONLY
      dc96: Composer STRING data type READ ONLY
      de99: Audio WAVE Codec UINT32 data type ANY 32BIT VALUE form READ ONLY
      de92: Bit Rate Type UINT16 data type enumeration: 1, 2,  READ ONLY
      de9a: Audio Bit Rate UINT32 data type range: MIN 1, MAX 1536000, STEP 1 
READ ONLY
      de94: Number Of Channels UINT16 data type enumeration: 1, 2, 3, 4, 5, 6, 
7, 8, 9,  READ ONLY
      de93: Sample Rate UINT32 data type range: MIN 8000, MAX 48000, STEP 1 
READ ONLY
   b902: OGG
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc9b: Album Artist STRING data type READ ONLY
      dc8b: Track UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc99: Original Release Date STRING data type DATETIME FORM READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc8c: Genre STRING data type READ ONLY
      dc96: Composer STRING data type READ ONLY
      de99: Audio WAVE Codec UINT32 data type ANY 32BIT VALUE form READ ONLY
      de92: Bit Rate Type UINT16 data type enumeration: 1, 2,  READ ONLY
      de9a: Audio Bit Rate UINT32 data type range: MIN 1, MAX 1536000, STEP 1 
READ ONLY
      de94: Number Of Channels UINT16 data type enumeration: 1, 2, 3, 4, 5, 6, 
7, 8, 9,  READ ONLY
      de93: Sample Rate UINT32 data type range: MIN 8000, MAX 48000, STEP 1 
READ ONLY
   b903: AAC
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc9b: Album Artist STRING data type READ ONLY
      dc8b: Track UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc99: Original Release Date STRING data type DATETIME FORM READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc8c: Genre STRING data type READ ONLY
      dc96: Composer STRING data type READ ONLY
      de99: Audio WAVE Codec UINT32 data type ANY 32BIT VALUE form READ ONLY
      de92: Bit Rate Type UINT16 data type enumeration: 1, 2,  READ ONLY
      de9a: Audio Bit Rate UINT32 data type range: MIN 1, MAX 1536000, STEP 1 
RE      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc48: Description STRING data type READ ONLY
      dc87: Width UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc88: Height UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc47: Date Authored STRING data type DATETIME FORM READ ONLY
   b984: 3GP
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc48: Description STRING data type READ ONLY
      dc87: Width UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc88: Height UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc47: Date Authored STRING data type DATETIME FORM READ ONLY
   ba05: Abstract Audio Video Playlist
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   ba10: WPL Playlist
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   ba11: M3U Playlist
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   ba14: PLS Playlist
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   ba82: XMLDocument
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   b906: FLAC
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   300a: MS AVI
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc48: Description STRING data type READ ONLY
      dc87: Width UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
      dc46: Artist STRING data type READ ONLY
      dc9a: Album Name STRING data type READ ONLY
      dc89: Duration UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc48: Description STRING data type READ ONLY
      dc87: Width UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc88: Height UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc47: Date Authored STRING data type DATETIME FORM READ ONLY
   ba83: Microsoft Word Document
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   ba85: Microsoft Excel Spreadsheet (.xls)
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
   ba86: Microsoft Powerpoint (.ppt)
      dc01: Storage ID UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc02: Object Format UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc03: Protection Status UINT16 data type ANY 16BIT VALUE form READ ONLY
      dc04: Object Size UINT64 data type READ ONLY
      dc07: Object File Name STRING data type GET/SET
      dc09: Date Modified STRING data type DATETIME FORM READ ONLY
      dc0b: Parent Object UINT32 data type ANY 32BIT VALUE form READ ONLY
      dc41: Persistant Unique Object Identifier UINT128 data type READ ONLY
      dc44: Name STRING data type READ ONLY
      dce0: Display Name STRING data type READ ONLY
      dc08: Date Created STRING data type DATETIME FORM READ ONLY
Storage Devices:
   StorageID: 0x00020001
      StorageType: 0x0004 removable RAM storage
      FilesystemType: 0x0002 generic hierarchical
      AccessCapability: 0x0000 read/write
      MaxCapacity: 31902400512
      FreeSpaceInBytes: 18489638912
      FreeSpaceInObjects: 1073741824
      StorageDescription: SD card
      VolumeIdentifier: (null)
   StorageID: 0x00010001
      StorageType: 0x0003 fixed RAM storage
      FilesystemType: 0x0002 generic hierarchical
      AccessCapability: 0x0000 read/write
      MaxCapacity: 56106594304
      FreeSpaceInBytes: 28740161536
      FreeSpaceInObjects: 1073741824
      StorageDescription: Internal storage
      VolumeIdentifier: (null)
Special directories:
   Default music folder: 0x00000d93
   Default playlist folder: 0xffffffff
   Default picture folder: 0xffffffff
   Default video folder: 0x00001911
   Default organizer folder: 0xffffffff
   Default zencast folder: 0xffffffff
   Default album folder: 0xffffffff
   Default text folder: 0xffffffff
MTP-specific device properties:
   Friendly name: (NULL)
   Synchronization partner: (NULL)
   Battery level 89 of 100 (88%)
libmtp supported (playable) filetypes:
   Folder
   Text file
   HTML file
   RIFF WAVE file
   ISO MPEG-1 Audio Layer 3
   MPEG video stream
   JPEG file
   BMP bitmap file
   GIF bitmap file
   Portable Network Graphics
   Microsoft Windows Media Audio
   Ogg container format
   Advanced Audio Coding (AAC)/MPEG-2 Part 7/MPEG-4 Part 3
   MPEG-4 Part 14 Container Format (Audio+Video Emphasis)
   Abstract Playlist file
   XML file
   Free Lossless Audio Codec (FLAC)
   Audio Video Interleave
   Microsoft Advanced Systems Format
   DOC file
   XLS file
   PPT file
Error 2: PTP Layer error 02ff: get_u64_from_object(): could not get unsigned 
64bit integer from object.
Error 2: Error 02ff: PTP: I/O error
Error 2: PTP Layer error 02ff: obj2file: call to 
ptp_mtp_getobjectpropssupported() failed.
Error 2: Error 02ff: PTP: I/O error
Error 2: PTP Layer error 02ff: obj2file: call to 
ptp_mtp_getobjectpropssupported() failed.

[above error repeats hundreds of times before]:

Error 2: Error 02ff: PTP: I/O error
ERROR: Could not close session!
inep: usb_get_endpoint_status(): No such device
outep: usb_get_endpoint_status(): No such device
OK.

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https://bugs.launchpad.net/bugs/1314556

Title:
  Unable to mount Android MTP device

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