Fails with reason 18: "NM_DEVICE_STATE_REASON_SHARED_START_FAILED Shared
connection service failed to start".

Sep 22 12:37:42 zeinab-Lenovo-G550 NetworkManager[537]: <warn> Activation 
(wlan0) Stage 5 of 5 (IP Configure Commit) start sharing failed.
Sep 22 12:37:42 zeinab-Lenovo-G550 NetworkManager[537]: <info> (wlan0): device 
state change: 7 -> 9 (reason 18)
Sep 22 12:37:42 zeinab-Lenovo-G550 NetworkManager[537]: <warn> Activation 
(wlan0) failed for access point (home3)
Sep 22 12:37:42 zeinab-Lenovo-G550 NetworkManager[537]: <info> Marking 
connection 'home3' invalid.
Sep 22 12:37:42 zeinab-Lenovo-G550 NetworkManager[537]: <warn> Activation 
(wlan0) failed.
Sep 22 12:37:42 zeinab-Lenovo-G550 NetworkManager[537]: <info> Activation 
(wlan0) Stage 5 of 5 (IP Configure Commit) complete.
Sep 22 12:37:42 zeinab-Lenovo-G550 NetworkManager[537]: <info> (wlan0): device 
state change: 9 -> 3 (reason 0)
Sep 22 12:37:42 zeinab-Lenovo-G550 NetworkManager[537]: <info> (wlan0): 
deactivating device (reason: 0).
[...]
Sep 22 12:37:42 zeinab-Lenovo-G550 NetworkManager[537]: <error> 
[1316682462.689265] [nm-device-wifi.c:1548] nm_device_wifi_set_mode(): (wlan0): 
error setting mode 2

** Summary changed:

- Network Manager fails to connect to any wireless network -- Broadcom BCM4312
+ NetworkManager sees but fails to connect to any wireless network -- Broadcom 
BCM4312

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https://bugs.launchpad.net/bugs/856289

Title:
  NetworkManager sees but fails to connect to any wireless network --
  Broadcom BCM4312

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