Network Connection problems after Upgrade to 10.04 LTS from 08.04 LTS

[NoOp]

On 05/10/2010 05:34 PM, Jay Ridgley wrote:
> Folks,
> 
> I am having severe problems connecting after doing an upgrade on my laptop...
> 
> I am no longer able to connect to any system on or from my home lan (It was 
> working before the upgrade)!!
> 
> History:
> 
> I shut down my laptop and packed it up for a trip to my son's for the weekend. 
> While there we(he and I) were trying to connect to his network with my wireless 
> card (it had never worked there - worked fine here) so he suggested that I 
> upgrade to 10.04. After that we still could not get wireless to work so I 
> continued to use the wired connection we had set up. That worked fine there.
> 
> Today I brought it home and tried to connect to my network and can not get a 
> connection using either wired or wireless hardware.
> 
> The /etc/hosts and /etc/interfaces files are correct; as far  as I can tell.
> I have also set up both a wired and a wireless entry using the network tools dialog.
> 
> Where do I begin to look for the problem???
> 
> NOTE: Until this is fixed and I know what caused the problems, I will be using 
> 08.04 on all my production systems and may return the laptop to it as well!

Don't return the laptop... just yet :-)

You say that your /etc/hosts & /etc/interfaces look correct - also check
/etc/resolv.conf. I guess it might be somewhat difficult to post here if
you can't get any networking on the laptop. However, it might help if
you can hand post the results here. Concentrate on getting the wired
connection working first.

Q. Do you have any other OS on the laptop (Windows or 8.04 for instance)
and if so does networking (wired or wireless) work there?

Can you try (on the laptop):

1. A liveCD (any should do, but also try 10.04) to see if wired
networking works there (note: you may have to configure in NM).

2. Reboot to 10.04 and issue (from a terminal):

$ ifconfig

See if you have an 'inet addr: <someIPaddress>' on the second line. Example:

$ ifconfig
eth0      Link encap:Ethernet  HWaddr <snipped>
          inet addr:192.168.2.100  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: <snipped> Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1492  Metric:1
          RX packets:210567 errors:0 dropped:0 overruns:0 frame:0
          TX packets:224847 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:138368090 (138.3 MB)  TX bytes:232410458 (232.4 MB)

If you are not getting an 'inet addr' then try:

$ sudo /etc/init.d/networking restart

and note the errors that you may (or may not) get.

Please also provide the details of your laptop. It's pretty hard for
anyone to assist if you don't at least provide basic information about
your hardware.

Let us know the results from the above & then folks on the list can work
from there.