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[Leo <leo4ward@xxxxxxxxx>]

This "modem key" worked out of the box for me in ubuntu 15.10.

However now, in 16.04, the "usb mode switch" is not done automatically
(both is the modem is plugged at boot or after).

I suppose it's an udev regression.

So, when the "key" is plugged (lsusb):

Bus 002 Device 010: ID 12d1:1f01 Huawei Technologies Co., Ltd.
E353/E3131 (Mass storage mode)

$ usb_modeswitch -J  -v 0x12d1 -p 0x1f01

=> Bus 002 Device 011: ID 12d1:14dc Huawei Technologies Co., Ltd.

And now the device work as expected and can be choosed in network
manager.

So there is no kernel problem for me.

-- 
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1527914

Title:
  Huawei E3372 is not detected and cannot be used

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  It does appear in lsb_usb, but networkmanager doesn't react to it or
  give me option to connect. It works in ubuntu-12.04.4-dvd-amd64.iso.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.3.0-2-generic 4.3.0-2.11 [modified: boot/vmlinuz-4.3.0-2-generic]
  ProcVersionSignature: Ubuntu 4.3.0-2.11-generic 4.3.0
  Uname: Linux 4.3.0-2-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.19.3-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mikaela    1352 F.... pulseaudio
   /dev/snd/controlC1:  mikaela    1352 F.... pulseaudio
  CurrentDesktop: MATE
  Date: Sat Dec 19 20:35:36 2015
  HibernationDevice: RESUME=UUID=431ec214-73ef-4058-b283-5721bb5a45d2
  InstallationDate: Installed on 2015-12-12 (7 days ago)
  InstallationMedia: Ubuntu-MATE 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151212)
  Lsusb:
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 0bda:57b4 Realtek Semiconductor Corp.
   Bus 001 Device 002: ID 13d3:3414 IMC Networks
   Bus 001 Device 006: ID 12d1:14dc Huawei Technologies Co., Ltd.
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: ASUSTeK COMPUTER INC. X550JX
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.3.0-2-generic.efi.signed root=UUID=ab0e7270-40bc-4a68-a541-59fd96690354 ro rw acpi_osi=
  RelatedPackageVersions:
   linux-restricted-modules-4.3.0-2-generic N/A
   linux-backports-modules-4.3.0-2-generic  N/A
   linux-firmware                           1.154
  SourcePackage: linux
  UdevLog: Error: [Errno 2] Tiedostoa tai hakemistoa ei ole: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/07/2015
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X550JX.204
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X550JX
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: ATN12345678901234567
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrX550JX.204:bd05/07/2015:svnASUSTeKCOMPUTERINC.:pnX550JX:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX550JX:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X550JX
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.

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