10.04 wired connection stopped working

[Worp8d]

Hi,

Installed 10.04 (fresh) on my media centre, everything worked fine and has done so for a week now. Turned it on today and there's no connection to the router. The router is fine as I'm connected on my laptop through it now. Pretty sure the cabling is fine (have checked it and have no reason to suspect anything has damaged it in the last 24 hours). I suspect an update has changed something but I don't know where to start looking for and fixing the problem. Anyone got any ideas?

[Worp8d]

sudo lshw -C network detects the network card and everything there looks normal.

[Iowan]

If you use DHCP, post results of sudo dhclient eth0

[Worp8d]

Listening on   LPF/etho0/6c:f0:49:1e:26:92
Sending on           LPF/etho0/6c:f0:49:1e:26:92
Sending on           Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 4
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 8
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 14
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 2
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

Thanks!

[Iowan]

Listening on LPF/etho0/6c:f0:49:1e:26:92
Sending on LPF/etho0/6c:f0:49:1e:26:92
...

Well, now we know why the connection isn't working... now why DHCP isn't working. I'm a bit curious if the highlighted text is a typo, or if the system is doing something weird.

[Worp8d]

Yeah I'm sorry, the 'etho0' should actually be 'eth0'; with not network connection I'm having to copy commands/responses off the screen.

[Worp8d]

I booted from the CD but the network didn't connect even though it connected and found my location automatically when I installed Lucid the first time. I've changed the connection to the router, switched cables and jiggled everything. Nothing.

Is there a way I can test the network card?

[Worp8d]

The router doesn't see the wired connection. Both

lspci | grep Network
lspci | grep eth0

produce nothing (found that on a forum post) but

lspci

finds

Ethernet controller: Realtek Semi... etc.

I'm completely at a loss here.

[Sixtease]

I'm experiencing the same problem. After the upgrade, the wired connection is no longer working. Running ifconfig only lists lo, no mention of eth0.
Mobile broadband via USB modem works OK though.

Update: Funny thing is... when I run sudo dhclient, the network starts working and I suddenly see eth0 in ifconfig.

[solentnewmedia]

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,

Please can someone look into this as it is very annoying I mean having to use windows lol