Public bug reported:

huawei E355 is a USB router (1x Ethernet-over-USB, 5 x WLAN) [1].

with ubuntu 12.04.3 LTS (3.8 series of kernel), it was recognised and
worked properly by default. a connection was created under the 'wired
connection' option just by plugging the device into the machine.
however, since then it never worked properly. in (x)ubuntu 13.10, an
alternative worked [2,3]; which unfortunately stopped working in xubuntu
14.04.

expected behaviour: one connection under wired connection and one under
wifi connection should be available. ubuntu 12.04.3 LTS, ubuntu 13.04
performed in expected manner.

present behaviour:  only wifi hotspot generated by the router could be
used. the ethernet over usb function is totally unavailable in (x)ubuntu
14.04.

possible reason: cdc_ncm kernel was changed beyond 3.8 series but the
changes  was not considered in the modem manager. in [2,3], the provided
solution was based on deactivating the changes made in the cdc_ncm
beyond 3.8 kernel series.

[1] -> http://www.huaweidevice.co.in/Products/MobileBroadband/E355.php
[2] -> http://forums.linuxmint.com/viewtopic.php?f=53&t=148990
[3] -> 
http://forum.ubuntuusers.de/topic/huawei-e355-als-kabelnetzwerk-einbinden-wwan0-/

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: modemmanager 1.0.0-2ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
Uname: Linux 3.13.0-19-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CurrentDesktop: XFCE
Date: Thu Apr 17 19:44:36 2014
InstallationDate: Installed on 2014-04-16 (1 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
SourcePackage: modemmanager
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: modemmanager (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug trusty

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https://bugs.launchpad.net/bugs/1309054

Title:
  huawei E355 usb router not working properly in xubuntu 14.04

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