10.04 wired connection stopped working

[Worp8d]

One of My Computers has this same problem was working fine until today, using 32bit version of 10.04 just rebooted to dualboot windows 7 and that works fine on same router/network card something is wrong with 10.04 on wired connections,

If you boot from the Ubuntu install CD does the network connection start working?

[Worp8d]

V. numerous wired and wired networking problem posts all over the forums/net, Clearly something wrong here.

Anyway, booted from Kubuntu 9.04 LiveCD and everything worked perfectly.

Frustrating.

[Worp8d]

Perhaps I'm shooting myself in the foot having this conversation with myself but since I've no other option I'll blog away.

Checked:
/etc/hosts
/etc/resolv.conf
/etc/network/interfaces

All files are fine. (Fine as in they're exactly the same as on this machine which is running fine.)


The only problem that I can see is that the lines

inet addr:192.168.2.100  Bcast:192.168.2.255  Mask:255.255.255.0
inet6 addr: <snipped> Scope:Link

(or similar) are mising from the 'eth0' section of the ifconfig report.

Onward ho.

[Iowan]

The problem I had on my Jaunty laptop doesn't seem to affect my Lucid desktop, but you're welcome to try some of the options.

[Worp8d]

Thanks for the reply! Unfortunately I don't see how that thread relates... suspect you copied the wrong link? Of course I didn't understand half the terms in the first post so I could easily be missing something.

I have been doing as much reading as I can get in on this topic but my experience is limited so going is slow. I've tried every vaguely-relevant fix I can find to no avail.

Which lead me to do a clean install.

Which leads me to here: way short of packages and still no connection. The funny thing is that the system worked, exactly as is, for a while. Then the problem appeared which led me to believe it was a buggy update. But a clean install doesn't fix the problem. I saw a post somewhere a while ago (before I reinstalled) that said something about part of the Linux networking system changing settings on the card itself, but I can't find it now. I'll keep looking.

So a summary of what I know:

The good:

ifconfig and lshw detect the ethernet card and everything seems to be working at the hardware level.
Kubuntu 9.04 LiveCD accesses the ethernet/internet connection fine.
/etc/resolv.conf exists and is correct.
/etc/hosts exists and is correct.

The bad:

NO DHCPOFFERS is the ultimate response to 'dhclient eth0'.
Tried static IP. Nothing.
Noticed that /etc/network/interfaces was missing the 'auto eth0', 'iface eth0 inet dhcp' lines, so I added them. After rebooting the network manager no longer showed any wired connections at all and the situation was generally worse. Have tried many permutations of this change with no improvement.
Removed network-manager package. No change.
Reinstalled Ubuntu (formatted partition). No change.

Where to from here then? To the fridge for one more beer and then to bed methinks. Perhaps it'll all be better tomorrow.

P.S. Should I be submitting a bug report for this? I have never reported a bug before so I'm a little uncertain as to the process.

[Iowan]

Oops... what was indeed the wrong link. Fixed now - but still no guarantees

[kwalters]

I got round this problem by using manually selected IP addresses instead of DHCP ones. I guessed from my Windows setup what was reasonable and defined my gateway as a DNS server. Suddenly it all worked; and later, when I changed back to DHCP, it still works. Don't ask me why

[Worp8d]

I have tried a static IP with no success. The really confusing thing is any time I use anything but (K)ubuntu 10.04 the connection works fine. I've submitted a bug report, hopefully something comes of that.

[Worp8d]

Got it! The answer, as stated in this thread was to turn the computer off, unplug all power sources and the network cable, leave the system for ~3min and then restart. Don't know what this achieves but the network is now connected!

I'm glad the network is back

[sibongak18]

how did you finally resolve this error. i am getting the same error. no connection to internet, network manager icon is hidden.

pls help