Can't get wired networking connected

Asked by Jaime Cruz

I've gone through several answers and don't see anything helpful. I have an HP Pavilion desktop machine. I had it running and networking just fine on a wireless connection. I've moved the computer to my office and plugged it into the wired router, and then disabled the wireless connection.

Now I can't network at all. For some reason, the computer didn't automatically sense the wired connection, and I can no longer get the wireless connection to work either. I'm completely dead in the water.

I have 12.04 (32-bit) installed on my laptop, and that had no problems switching from the wired to the wireless adapter when I was in a hotel room, why am I having these problems with the 64-bit? What information do you need? I'm using my laptop right now as the desktop is unable to network in any fashion.


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English Edit question
Ubuntu gnome-nettool Edit question
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Solved by:
Jaime Cruz
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Jaime Cruz (jaime-cruz) said :

For more detail on the hardware:
HP Pavillion P7-1235

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actionparsnip (andrew-woodhead666) said :

If you run:

echo "nameserver" | sudo tee /etc/resolv.conf > /dev/null

Do you get web access?

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Jaime Cruz (jaime-cruz) said :

Nope, nothing. I double-checked the command specified and I did type it exactly as shown. What other information do you need?

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actionparsnip (andrew-woodhead666) said :

If you run:

sudo lshw -C network

What is output?

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Jaime Cruz (jaime-cruz) said :

Thank you for your assistance, Andrew. While I was waiting for your response I discovered my problem was two-fold. The first was self-inflicted because I didn't know what I was doing as I was Googling symptoms. I found a reference to editing /etc/network/interfaces, and using the information I gleaned from ifconfig -a, I mistakenly added an entry for my wireless adapter. That's what killed my wireless connection. Took me awhile to figure that out, but once I removed that entry I got wireless back.

A little more digging once I had wireless back and I learned from the "sudo lshw -C network" command that eth1 was "UNCLAIMED" which means "no driver." I did a little searching on AR8161 and found this page:

Turns out the driver is not part of the 12.04.1 LTS installation bundle and it has to be compiled into the kernel. Fortunately that page gives detailed instructions and once I was done, wired internet immediately became active.

So I learned a lot... most important: If you don't understand what you're doing, DON'T DO IT. On the other hand, how else do I learn, right?