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I am using Ubuntu 14.04. My network-manager automatically turns off every now. Then, I have to restart it manually using the terminal.

How should I debug this problem?

Here is the dmesg output:

[27851.368090] wlan0: deauthenticated from f8:XX:XX:XX:XX:b5 (Reason: 6)
[27851.423459] cfg80211: Calling CRDA to update world regulatory domain
[27851.427772] cfg80211: World regulatory domain updated:
[27851.427777] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[27851.427780] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.427783] cfg80211:   (2457000 KHz - 2482000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.427785] cfg80211:   (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm)
[27851.427787] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.427789] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.428215] cfg80211: Calling CRDA for country: US
[27851.432231] cfg80211: Regulatory domain changed to country: US
[27851.432236] cfg80211:   (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)
[27851.432239] cfg80211:   (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2700 mBm)
[27851.432241] cfg80211:   (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 1700 mBm)
[27851.432243] cfg80211:   (5250000 KHz - 5330000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.432245] cfg80211:   (5490000 KHz - 5600000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.432247] cfg80211:   (5650000 KHz - 5710000 KHz @ 40000 KHz), (300 mBi, 2000 mBm)
[27851.432249] cfg80211:   (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 3000 mBm)
[27851.432251] cfg80211:   (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 4000 mBm)
[27867.139843] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
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    Can you clarify whether it is the network-manager service that is failing, or the on-screen nm-applet? – steeldriver Mar 1 '15 at 19:34
  • are you sure you have applied all the updates? this used to be a problem for me when 14.04 first came out but is no longer. – mchid Mar 1 '15 at 19:47
  • use the command dmesg to get info on what happens when the service fails or closes. – mchid Mar 1 '15 at 19:48
  • 1
    its the network manager which fails not the nm-applet – working Mar 5 '15 at 23:19
  • Could you check output of grep NetworkManager /var/log/syslog and zcat /var/log/upstart/network-manager.log.1.gz. May better to try, after it stops don't start service again, but switch to root sudo su and run NetworkManager --no-daemon. Then check its output before it turns off. – user.dz Mar 20 '15 at 16:34
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You can try disabling the n mode of the driver with these commands:

echo "options iwlwifi 11n_disable=1" | sudo tee /etc/modprobe.d/iwlwifi.conf
sudo modprobe -rfv iwlwifi
sudo modprobe -v iwlwifi

If still has problems, try deactivating the power management of the card with this command:

sudo iwconfig wlan0 power off

Source: http://ubuntuforums.org/showthread.php?t=2219014&p=12998326#post12998326

  • i tried, dint work! – working Mar 20 '15 at 23:33
  • What is the model/brand of your computer? – Helio Mar 21 '15 at 9:11
  • Its dell inspiron 15R – working Mar 21 '15 at 14:44
  • I edited my answer. Try now. – Helio Mar 21 '15 at 18:22

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