syslog
Jun 16 01:01:48 user NetworkManager[908]: <info> Activation (ttyUSB1) starting 
connection 'MTS'
Jun 16 01:01:48 user NetworkManager[908]: <info> (ttyUSB1): device state 
change: disconnected -> prepare (reason 'none') [30 40 0]
Jun 16 01:01:48 user NetworkManager[908]: <info> NetworkManager state is now 
CONNECTING
Jun 16 01:01:48 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 1 
of 5 (Device Prepare) scheduled...
Jun 16 01:01:48 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 1 
of 5 (Device Prepare) started...
Jun 16 01:01:48 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 1 
of 5 (Device Prepare) complete.
Jun 16 01:01:48 user ModemManager[792]: <info>  Simple connect started...
Jun 16 01:01:48 user ModemManager[792]: <info>  Simple connect state (3/8): 
Enable
Jun 16 01:01:48 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: state changed (disabled -> enabling)
Jun 16 01:01:48 user NetworkManager[908]: <info> (ttyUSB1) modem state changed, 
'disabled' --> 'enabling' (reason: user-requested)
Jun 16 01:01:48 user ModemManager[792]: <warn>  (ttyUSB1): port attributes not 
fully set
Jun 16 01:01:48 user ModemManager[792]: <warn>  (ttyUSB0): port attributes not 
fully set
Jun 16 01:01:48 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed 
(unknown -> registering)
Jun 16 01:01:48 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: 3GPP Registration state changed 
(registering -> home)
Jun 16 01:01:49 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: 3GPP location updated (MCC: '0', MNC: 
'0', Location area code: 'D0B', Cell ID: '5412005')
Jun 16 01:01:49 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: 3GPP location updated (MCC: '250', MNC: 
'1', Location area code: 'D0B', Cell ID: '5412005')
Jun 16 01:01:49 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: state changed (enabling -> registered)
Jun 16 01:01:49 user ModemManager[792]: <info>  Simple connect state (4/8): 
Wait to get fully enabled
Jun 16 01:01:49 user ModemManager[792]: <info>  Simple connect state (5/8): 
Register
Jun 16 01:01:49 user ModemManager[792]: <info>  Simple connect state (6/8): 
Bearer
Jun 16 01:01:49 user ModemManager[792]: <info>  Simple connect state (7/8): 
Connect
Jun 16 01:01:49 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: state changed (registered -> connecting)
Jun 16 01:01:49 user NetworkManager[908]: <info> (ttyUSB1) modem state changed, 
'enabling' --> 'registered' (reason: user-requested)
Jun 16 01:01:49 user NetworkManager[908]: <info> WWAN now enabled by management 
service
Jun 16 01:01:49 user NetworkManager[908]: <info> (ttyUSB1) modem state changed, 
'registered' --> 'connecting' (reason: user-requested)
Jun 16 01:01:49 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: signal quality updated (77)
Jun 16 01:01:50 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: access technology changed (unknown -> 
umts)
Jun 16 01:01:50 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: state changed (connecting -> connected)
Jun 16 01:01:50 user ModemManager[792]: <info>  Simple connect state (8/8): All 
done
Jun 16 01:01:50 user NetworkManager[908]: <info> (ttyUSB1) modem state changed, 
'connecting' --> 'connected' (reason: user-requested)
Jun 16 01:01:50 user NetworkManager[908]: <warn> (ttyUSB1): failed to look up 
interface index
Jun 16 01:01:50 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 2 
of 5 (Device Configure) scheduled...
Jun 16 01:01:50 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 2 
of 5 (Device Configure) starting...
Jun 16 01:01:50 user NetworkManager[908]: <info> (ttyUSB1): device state 
change: prepare -> config (reason 'none') [40 50 0]
Jun 16 01:01:50 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 2 
of 5 (Device Configure) successful.
Jun 16 01:01:50 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 3 
of 5 (IP Configure Start) scheduled.
Jun 16 01:01:50 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 2 
of 5 (Device Configure) complete.
Jun 16 01:01:50 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 3 
of 5 (IP Configure Start) started...
Jun 16 01:01:50 user NetworkManager[908]: <info> (ttyUSB1): device state 
change: config -> ip-config (reason 'none') [50 70 0]
Jun 16 01:01:50 user NetworkManager[908]: <info> using modem-specified IP 
timeout: 20 seconds
Jun 16 01:01:50 user NetworkManager[908]: <info> starting PPP connection
Jun 16 01:01:50 user NetworkManager[908]: <info> pppd started with pid 3849
Jun 16 01:01:50 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 4 
of 5 (IPv6 Configure Timeout) scheduled...
Jun 16 01:01:50 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 3 
of 5 (IP Configure Start) complete.
Jun 16 01:01:50 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 4 
of 5 (IPv6 Configure Timeout) started...
Jun 16 01:01:50 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 4 
of 5 (IPv6 Configure Timeout) complete.
Jun 16 01:01:50 user pppd[3849]: Plugin 
/usr/lib/i386-linux-gnu/pppd/2.4.5/nm-pppd-plugin.so loaded.
Jun 16 01:01:50 user pppd[3849]: pppd 2.4.5 started by root, uid 0
Jun 16 01:01:50 user pppd[3849]: Using interface ppp0
Jun 16 01:01:50 user pppd[3849]: Connect: ppp0 <--> /dev/ttyUSB1
Jun 16 01:01:50 user NetworkManager[908]:    SCPlugin-Ifupdown: devices added 
(path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Jun 16 01:01:50 user NetworkManager[908]:    SCPlugin-Ifupdown: device added 
(path: /sys/devices/virtual/net/ppp0, iface: ppp0): no ifupdown configuration 
found.
Jun 16 01:01:50 user NetworkManager[908]: <warn> /sys/devices/virtual/net/ppp0: 
couldn't determine device driver; ignoring...
Jun 16 01:02:10 user NetworkManager[908]: <warn> pppd timed out or didn't 
initialize our dbus module
Jun 16 01:02:10 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 4 
of 5 (IPv4 Configure Timeout) scheduled...
Jun 16 01:02:10 user pppd[3849]: Terminating on signal 15
Jun 16 01:02:10 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 4 
of 5 (IPv4 Configure Timeout) started...
Jun 16 01:02:10 user NetworkManager[908]: <info> (ttyUSB1): device state 
change: ip-config -> failed (reason 'ip-config-unavailable') [70 120 5]
Jun 16 01:02:10 user NetworkManager[908]: <info> NetworkManager state is now 
DISCONNECTED
Jun 16 01:02:10 user NetworkManager[908]: <warn> Activation (ttyUSB1) failed 
for connection 'MTS'
Jun 16 01:02:10 user NetworkManager[908]: <info> Activation (ttyUSB1) Stage 4 
of 5 (IPv4 Configure Timeout) complete.
Jun 16 01:02:10 user NetworkManager[908]: <info> (ttyUSB1): device state 
change: failed -> disconnected (reason 'none') [120 30 0]
Jun 16 01:02:10 user NetworkManager[908]: <info> (ttyUSB1): deactivating device 
(reason 'none') [0]
Jun 16 01:02:10 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: state changed (connected -> 
disconnecting)
Jun 16 01:02:10 user NetworkManager[908]: <info> (ttyUSB1) modem state changed, 
'connected' --> 'disconnecting' (reason: user-requested)
Jun 16 01:02:11 user ModemManager[792]: <warn>  (ttyUSB1): port attributes not 
fully set
Jun 16 01:02:12 user avahi-daemon[887]: Withdrawing workstation service for 
ppp0.
Jun 16 01:02:12 user NetworkManager[908]:    SCPlugin-Ifupdown: devices removed 
(path: /sys/devices/virtual/net/ppp0, iface: ppp0)
Jun 16 01:02:12 user ModemManager[792]: <info>  Modem 
/org/freedesktop/ModemManager1/Modem/0: state changed (disconnecting -> 
registered)
Jun 16 01:02:12 user NetworkManager[908]: <info> (ttyUSB1) modem state changed, 
'disconnecting' --> 'registered' (reason: user-requested)
Jun 16 01:05:01 user CRON[5117]: (root) CMD (command -v debian-sa1 > /dev/null 
&& debian-sa1 1 1)

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https://bugs.launchpad.net/bugs/1330262

Title:
  HUAWEI E3531 not connected on Ubuntu 14.04

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