Kubuntu network problem after format

[eXecutioner]

I'm using on the same computer Windows Xp and Kubuntu 6.0.6... I had a problem with Windows and formatted that partition. I didn't know how to replace GRUB and installed kubuntu over the old one. Now I can't access Internet any more on kubuntu... Not even with the Live CD...

[eXecutioner]

My network card is Realtek RTL8168/8111 PCI-E Gigabit.

The thing is that the first time when I installed kubuntu it worked perfect... I didn't have to configure anything. After I formated the partition even the Live CD was not able to connect to the Internet and could not install the security updates.

My /etc/networks/interfaces looks normal... Just it has like 5 interfaces... Is this OK?

I got an ifconfig result here:

root@dragosh-desktop:~# ifconfig eth0
eth0 Link encap:Ethernet HWaddr 00:13:8F9:B3:A5
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:2702 errors:0 dropped:0 overruns:0 frame:0
TX packets:7 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:175472 (171.3 KiB) TX bytes:2394 (2.3 KiB)
Interrupt:185 Base address:0xe800


and a dhclient...
root@dragosh-desktop:~# dhclient eth0
Internet Systems Consortium DHCP Client V3.0.3
Copyright 2004-2005 Internet Systems Consortium.
All rights reserved.
For info, please visit http://www.isc.org/products/DHCP

Listening on LPF/eth0/00:13:8f:d9:b3:a5
Sending on LPF/eth0/00:13:8f:d9:b3:a5
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 6
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 11
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 21
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 19
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

[Rtoip]

Do you have a line in /etc/network/interfaces like this:

auto eth0

Maybe you will need also to add:

iface eth0 inet dhcp

If not,add it. Try after running kubuntu in terminal: sudo ifconfig eth0 down
later on: sudo ifconfig eth0 up
Next: sudo /etc/init.d/networking restart

Maybe it will help

[eXecutioner]

I've solved it eventually... I couldn't figure out what was the problem but after I moved to a different network it was just working...
The thing is that I had the same problem on Xubuntu and I couldn't do anything about that.
Thanks for your advice anyway...

[andersbolager]

You may try this out:
http://articles.techrepublic.com.com...1-6174075.html
It helped me in a similar situation

Regards,
Anders