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I'm running Ubuntu 14.04 and the network manager suddenly stopped working so I can't access the internet. The network manager icon doesn't appear in the bar. When I access the network manager from settings, there is a blank window (usually there is a history of wifi connections as far as I remember).

On the last session it worked properly. Today suddenly it's not working - neither via ethernet nor via wifi. Although on the Windows internet connection is working properly.

I tried to restart the network manager via the terminal using this command:

sudo service network-manager restart

The output was: "Stop: Unknown instance: network-manager start/running, process 2256"

... but the network manager still isn't working (nor after I restarted the PC).

That's all I figured out with my ubuntu skills so I ask for your help. I'll appreciate any tips!

  • Same problem here. Apparently the same happened a few months ago to people with the -proposed repository enabled. Did they push the update without fixing it? That's appalling, I think I'll finally stop using Ubuntu after this. askubuntu.com/questions/727127/… – fqq May 13 '16 at 20:10
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First, I used these commands (thanks, Beleriand):

sudo ifconfig eth0 up
sudo dhclient eth0

Then I solved it by upgrading the network manager: 14.04 - Network manager stopped working

Thank you!

  • 2
    Further to the František Kopřiva's answer, this appears to be a problem relating to network manager not having been upgraded yet, but libnl3 has been, causing a conflict. Once you've got a working network connection by the above method, you should be able to get network manager upgraded using sudo apt-get update and then sudo apt-get upgrade – fred2 May 14 '16 at 14:32
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Same problem here as many other users have this after todays update.

sudo ifconfig eth0 up
sudo dhclient eth0

will fix the problem temporarily but after reboot it wont work

  • This commands really fixed it for the actual session. – František Kopřiva May 13 '16 at 21:38
  • See comment by @fred2 above which resolves it after reboot. – Graham May 14 '16 at 18:27
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I am having the same problem, out of the sudden network manager disappeared and I cannot access the internet. It seems to be a problem related to Network Manager (the app). I tried to reinstall it but it did not worked. There is a couple of tests that you can do on Terminal sudo lshw -C network iwconfig ifconfig -a nm-tool rfkill list wifi

It is really important you try these commands on Terminal for anyone to know what is happening in your computer.

My results: sudo lshw -C network

*-network DESABILITADO descrição: Interface sem fio produto: RT3290 Wireless 802.11n 1T/1R PCIe fabricante: Ralink corp. ID físico: 0 informações do barramento: pci@0000:01:00.0 nome lógico: wlan0 versão: 00 serial: 80:56:f2:cb:01:19 largura: 32 bits clock: 33MHz capacidades: pm msi pciexpress bus_master cap_list ethernet physical wireless configuração: broadcast=yes driver=rt2800pci driverversion=3.19.0-47-generic firmware=N/A latency=0 link=no multicast=yes wireless=IEEE 802.11bgn recursos: irq:16 memória:52510000-5251ffff *-network DESABILITADO descrição: Ethernet interface produto: RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller fabricante: Realtek Semiconductor Co., Ltd. ID físico: 0 informações do barramento: pci@0000:02:00.0 nome lógico: eth0 versão: 05 serial: a0:d3:c1:6a:3a:5c tamanho: 10Mbit/s capacidade: 100Mbit/s largura: 64 bits clock: 33MHz capacidades: pm msi pciexpress msix vpd bus_master cap_list ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation configuração: autonegotiation=on broadcast=yes driver=r8169 driverversion=2.3LK-NAPI duplex=half latency=0 link=no multicast=yes port=MII speed=10Mbit/s recursos: irq:28 porta de E/S:3000(tamanho=256) memória:52404000-52404fff memória:52400000-52403fff

This means my Network is disabled (desabilitado)

iwconfig

eth0 no wireless extensions.

wlan0 IEEE 802.11bgn ESSID:off/any Mode:Managed Access Point: Not-Associated Tx-Power=0 dBm
Retry short limit:7 RTS thr:off Fragment thr:off Power Management:off

lo no wireless extensions.

ifconfig -a

eth0 Link encap:Ethernet Endereço de HW a0:d3:c1:6a:3a:5c BROADCAST MULTICAST MTU:1500 Métrica:1 pacotes RX:0 erros:0 descartados:0 excesso:0 quadro:0 Pacotes TX:0 erros:0 descartados:0 excesso:0 portadora:0 colisões:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

lo Link encap:Loopback Local inet end.: 127.0.0.1 Masc:255.0.0.0 endereço inet6: ::1/128 Escopo:Máquina UP LOOPBACK RUNNING MTU:65536 Métrica:1 pacotes RX:1906 erros:0 descartados:0 excesso:0 quadro:0 Pacotes TX:1906 erros:0 descartados:0 excesso:0 portadora:0 colisões:0 txqueuelen:0 RX bytes:167560 (167.5 KB) TX bytes:167560 (167.5 KB)

wlan0 Link encap:Ethernet Endereço de HW 80:56:f2:cb:01:19 BROADCAST MULTICAST MTU:1500 Métrica:1 pacotes RX:0 erros:0 descartados:0 excesso:0 quadro:0 Pacotes TX:0 erros:0 descartados:0 excesso:0 portadora:0 colisões:0 txqueuelen:1000 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B)

nm-tool

** (process:7376): WARNING **: Could not initialize NMClient /org/freedesktop/NetworkManager: The name org.freedesktop.NetworkManager was not provided by any .service files

NetworkManager Tool

State: unknown

** (process:7376): WARNING **: error: could not connect to NetworkManager

This means that the computer simply cannot access network manager.

rfkill list wifi

0: phy0: Wireless LAN Soft blocked: no Hard blocked: no

This means that there is no software or hardware blocking the network adapter.

So far I did not manage to solve my problem yet.

But as far as I know, if your rfkill list wifi shows it is hard blocked, there is probably a switch and you can turn your network adapter on through FN+f12 or by looking into a proper switch (Physical).

I hope it helps

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