estou com o mesmo problema sendo que aqui e um modem3g a interface do networtk não aparece na barra superior do ubuntu 15.10 mas quando coloco para rodar pela placa virtual de rede o modem funciona normalmete.
fogobranco@fogobranco-GA-78LMT-S2:~$ ping -c 4 8.8.8.8
PING 8.8.8.8 (8.8.8.
56(84) bytes of data.
64 bytes from 8.8.8.8: icmp_seq=1 ttl=54 time=2299 ms
64 bytes from 8.8.8.8: icmp_seq=2 ttl=54 time=2129 ms
64 bytes from 8.8.8.8: icmp_seq=3 ttl=54 time=2000 ms
64 bytes from 8.8.8.8: icmp_seq=4 ttl=54 time=1800 ms
fogobranco@fogobranco-GA-78LMT-S2:~$ ping -c 4
www.google.comPING
www.google.com (64.233.190.105) 56(84) bytes of data.
64 bytes from gsademo24.google.com (64.233.190.105): icmp_seq=1 ttl=43 time=762 ms
64 bytes from gsademo24.google.com (64.233.190.105): icmp_seq=2 ttl=43 time=1073 ms
64 bytes from gsademo24.google.com (64.233.190.105): icmp_seq=3 ttl=43 time=1040 ms
64 bytes from gsademo24.google.com (64.233.190.105): icmp_seq=4 ttl=43 time=751
fogobranco@fogobranco-GA-78LMT-S2:~$ lsusb
Bus 007 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 006 Device 003: ID 12d1:1003 Huawei Technologies Co., Ltd. E220 HSDPA Modem / E230/E270/E870 HSDPA/HSUPA Modem
Bus 006 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
fogobranco@fogobranco-GA-78LMT-S2:~$ sudo lshw -C network
[sudo] password for fogobranco:
*-network
description: Ethernet interface
product: RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller
vendor: Realtek Semiconductor Co., Ltd.
physical id: 0
bus info: pci@0000:02:00.0
gostaria de saber se tem como resetar totalmente a configuração do networkManager ou usar "" WICD para configura o modem 3g""
logical name: enp2s0
version: 06
serial: 90:2b:34:f7:be:7c
size: 10Mbit/s
capacity: 1Gbit/s
width: 64 bits
clock: 33MHz