Networking on my karmic laptop doesn't work any more!!

[NoOp]

On 06/08/2010 08:12 AM, drew einhorn wrote:
> It worked just fine last night.
> 
> First thing I noticed is that web pages are no  longer accessible.
> 
> Then I looked for the NetworkManager icon in the panel.
> It's not there.
> 
> I have another partition that boots into a test copy of lucid.
> rebooted to that partition.  Networking works there, so nothing
> happened to the laptop hardware or the access point.
> 
> Then I tried plugging in a network cable for a wired connection.
> That didn't work either.

The missing NM applet may be telling. The applet is provided by
network-manager-gnome and is placed in the Notification area applet.

You may try:

$ ifconfig

to see if you actually have an IP.

$ sudo apt-get /etc/init.d/networking restart

and then check ifconfig to ensure that you've actually got an IP address
& then ping google.com or yahoo.com etc to see if you can ping.

If networking is actually working but the NM applet just isn't showing
up, then it might be worth reinstalling:

$ sudo apt-get install --reinstall network-manager network-manager-gnome

If you do not have those packages archived on your system & have no
working network, you can download them via another machine & 'sneaker
net' them to the laptop:

http://packages.ubuntu.com/karmic/network-manager
http://packages.ubuntu.com/karmic/network-manager-gnome
scroll down to the "Download network..." and click on the appropriate
architecture (amd64 or i386). Download the .deb & reinstall.

But I'd first look at ifconfig that is actually showing. If you have an
proper IP address, then you may actually have a working network connect
& just not know it. Try a ping to google.com yahoo.com etc.

If not, post the results of ifconfig, iwconfig, & 'cat
/etc/network/interfaces'.