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I tried to use

sudo service networking restart

and

sudo /etc/init.d/network restart

but they both crash the window manager and I can no longer use my keyboard for input into X.

when I use the /etc/init.d/ method it complains saying that I should use the service utility

e.g. service networking restart

but it crashes just the same.

Is there a GUI method of restarting networking?

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Note that you might reanimate your keyboard, if you unplug and replug it - and it is hot pluggable, i.e. USB. –  user unknown Dec 19 '12 at 20:02
    
I also faced similar issue on Gnome 3 on Ubuntu 13.03. Screen disorted as top bar gone. Short keys not worked. As no menu/Activies shown I get no way to operate the system. Luckily console was opened already. So reboot command can be typed. –  kuldeep.kamboj Jul 22 '13 at 10:48

8 Answers 8

Try

sudo service network-manager restart

instead.

Ubuntu uses network-manager instead of the traditional Linux networking model. so you should restart the network-manager service instead of the network service. Or use ifup/down.

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1  
hmm, strange that restarting just networking breaks the system. Does it happen to you too or is it just me? –  waspinator Dec 19 '12 at 21:25
1  
@waspinator - it happens to me too. (FYI.) –  Josh M. Dec 29 '13 at 3:31

Restarting networking on a desktop machine will cause dbus and a bunch of service to stop and never be started again, usually leading to the whole system being unusable.

As Ubuntu does event based network bring up, there quite simply isn't a way to undo it all and redo it all, so a restart just isn't plain possible. The recommended way instead is to use ifdown and ifup on the interfaces you actually want to reconfigure:

sudo ifdown --exclude=lo -a && sudo ifup --exclude=lo -a
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I'm getting ifup: failed to open lockfile /run/network/.ifstate.lock: Permission denied even on --force –  Dee Nov 15 '13 at 11:52
    
@Jorge Castro: is this behavior going to be fixed, or is it broken by design? –  waspinator Jul 19 at 20:52
1  
@waspinator the bug is marked fixed as of march of this year: bugs.launchpad.net/ubuntu/+source/dbus/+bug/1072518 –  Jorge Castro Jul 20 at 4:03

Try using the indicator (top menu bar) to disable and then enable networking.

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You could try

ifconfig eth0 down

then

ifconfig eth0 up

(or whatever your network interface is called) to restart the network.

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I've got the same issue. Its a known bug https://bugs.launchpad.net/ubuntu/+source/dbus/+bug/1102507

Using service network-manager restart works through

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service network-manager restart doesn't work:

stop: Unknown job network-manager
start: Unknown job network-manager

The only thing that works is:

ifconfig eth0 down
ifconfig eth0 up
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ubuntu CLI: to restart the network service either

sudo /etc/init.d/networking restart

or

ifdown eth0
ifup eth0
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In ubuntu 14.04 they have a new "feature" that makes it impossible to restart. Force the interface down and up works.

  sudo ip link set eth0 down
  sudo ip link set eth0 up
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