Public bug reported:

I have a USB 3G modem that works find in Kubuntu.  There, I can plug it
in and the system automatically detects and sets it up.  It appears as a
wired network interface and basically works out of the box with no
actions needed on my part.  However, in Lubuntu, the same modem is not
found and even the nm-connection-editor can't find it when I run it
manually.
The modem is a Huawei E3131:

$ lsusb | grep -i huawei
Bus 001 Device 006: ID 12d1:1f01 Huawei Technologies Co., Ltd. 

What should happen is that Lubuntu should find the modem and set it up
like in Kubuntu.  I have read that others have 3G modems working so the
issue might be with just this model of modem.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: network-manager-gnome 0.9.8.0-1ubuntu2
ProcVersionSignature: Ubuntu 3.10.0-6.17-generic 3.10.3
Uname: Linux 3.10.0-6-generic x86_64
ApportVersion: 2.12-0ubuntu3
Architecture: amd64
CRDA: Error: [Errno 2] No such file or directory: 'iw'
Date: Fri Aug 16 12:11:34 2013
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
InstallationDate: Installed on 2013-08-09 (6 days ago)
InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Alpha amd64+mac (20130808)
IpRoute:
 default via 192.168.2.1 dev eth0  proto static 
 192.168.2.0/24 dev eth0  proto kernel  scope link  src 192.168.2.36  metric 1
MarkForUpload: True
NetworkManager.state:
 [main]
 NetworkingEnabled=true
 WirelessEnabled=true
 WWANEnabled=true
 WimaxEnabled=true
SourcePackage: network-manager-applet
UpgradeStatus: No upgrade log present (probably fresh install)
nmcli-con:
 NAME                      UUID                                   TYPE          
    TIMESTAMP    TIMESTAMP-REAL                     AUTOCONNECT   READONLY   
DBUS-PATH                                 
 Wired connection 1        8ee33eaa-5ef1-4a5f-8995-c38b6bd45b55   
802-3-ethernet    1376644140   pe 16. elokuuta 2013 12.09.00      yes           
no         /org/freedesktop/NetworkManager/Settings/0
nmcli-dev:
 DEVICE     TYPE              STATE         DBUS-PATH                           
       
 wlan0      802-11-wireless   disconnected  
/org/freedesktop/NetworkManager/Devices/1  
 eth0       802-3-ethernet    connected     
/org/freedesktop/NetworkManager/Devices/0
nmcli-nm:
 RUNNING         VERSION    STATE           NET-ENABLED   WIFI-HARDWARE   WIFI  
     WWAN-HARDWARE   WWAN      
 running         0.9.8.0    connected       enabled       enabled         
enabled    enabled         disabled

** Affects: network-manager-applet (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug saucy

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https://bugs.launchpad.net/bugs/1212997

Title:
  USB 3G modem not found in Lubuntu

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