wired connection not working after i updated and upgraded my system.

[shreyashukla]

So i upgraded and updated my system (ubuntu 10.04) using terminal, and after that internet (eth0) won't connect. i don't know much about ubuntu, but have been using it for more than a year (and i love it), so i really need beginner's help here. someone please help me get my internet back on please. [version-ubuntu 10.04].

P.S-i need internet urgently as i have to take mock tests for an exam i'm sitting for in a few days. please please please, help me people

[nujinini]

So i upgraded and updated my system (ubuntu 10.04) using terminal, and after that internet (eth0) won't connect. i don't know much about ubuntu, but have been using it for more than a year (and i love it), so i really need beginner's help here. someone please help me get my internet back on please. [version-ubuntu 10.04].

P.S-i need internet urgently as i have to take mock tests for an exam i'm sitting for in a few days. please please please, help me people

My first step on trying to solve this problem is to post the outputs asked here. It would make it easier for the wireless gurus to spot any problems.

[MikeTbob]

Hello and Welcome.
Did you install the driver yourself when you installed Ubuntu? If yes, then you'll need to re-install them after updating the kernel.
Post the output of

sudo lspci -knn

sudo ifconfig -a

[jayd512]

Hello there!

Just adding to the request for information...
Please also post the output of

dmesg | grep Ethernet

[shreyashukla]

output for sudo lspci -knn

00:00.0 Host bridge [0600]: Intel Corporation Mobile PM965/GM965/GL960 Memory Controller Hub [8086:2a00] (rev 0c)
	Kernel driver in use: agpgart-intel
	Kernel modules: intel-agp
00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller [8086:2a02] (rev 0c)
	Kernel driver in use: i915
	Kernel modules: i915
00:02.1 Display controller [0380]: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller [8086:2a03] (rev 0c)
00:1a.0 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #4 [8086:2834] (rev 03)
	Kernel driver in use: uhci_hcd
00:1a.1 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #5 [8086:2835] (rev 03)
	Kernel driver in use: uhci_hcd
00:1a.7 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #2 [8086:283a] (rev 03)
	Kernel driver in use: ehci_hcd
00:1b.0 Audio device [0403]: Intel Corporation 82801H (ICH8 Family) HD Audio Controller [8086:284b] (rev 03)
	Kernel driver in use: HDA Intel
	Kernel modules: snd-hda-intel
00:1c.0 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express Port 1 [8086:283f] (rev 03)
	Kernel driver in use: pcieport
	Kernel modules: shpchp
00:1c.1 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express Port 2 [8086:2841] (rev 03)
	Kernel driver in use: pcieport
	Kernel modules: shpchp
00:1c.3 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express Port 4 [8086:2845] (rev 03)
	Kernel driver in use: pcieport
	Kernel modules: shpchp
00:1c.4 PCI bridge [0604]: Intel Corporation 82801H (ICH8 Family) PCI Express Port 5 [8086:2847] (rev 03)
	Kernel driver in use: pcieport
	Kernel modules: shpchp
00:1d.0 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #1 [8086:2830] (rev 03)
	Kernel driver in use: uhci_hcd
00:1d.1 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #2 [8086:2831] (rev 03)
	Kernel driver in use: uhci_hcd
00:1d.2 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB UHCI Controller #3 [8086:2832] (rev 03)
	Kernel driver in use: uhci_hcd
00:1d.7 USB Controller [0c03]: Intel Corporation 82801H (ICH8 Family) USB2 EHCI Controller #1 [8086:2836] (rev 03)
	Kernel driver in use: ehci_hcd
00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev f3)
00:1f.0 ISA bridge [0601]: Intel Corporation 82801HEM (ICH8M) LPC Interface Controller [8086:2815] (rev 03)
	Kernel modules: iTCO_wdt
00:1f.1 IDE interface [0101]: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) IDE Controller [8086:2850] (rev 03)
	Kernel driver in use: ata_piix
00:1f.2 SATA controller [0106]: Intel Corporation 82801HBM/HEM (ICH8M/ICH8M-E) SATA AHCI Controller [8086:2829] (rev 03)
	Kernel driver in use: ahci
	Kernel modules: ahci
00:1f.3 SMBus [0c05]: Intel Corporation 82801H (ICH8 Family) SMBus Controller [8086:283e] (rev 03)
	Kernel modules: i2c-i801
06:00.0 Network controller [0280]: Broadcom Corporation BCM4312 802.11b/g [14e4:4315] (rev 01)
	Kernel driver in use: b43-pci-bridge
	Kernel modules: ssb
07:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168B PCI Express Gigabit Ethernet controller [10ec:8168] (rev 02)
	Kernel driver in use: r8169
	Kernel modules: r8169
08:05.0 FireWire (IEEE 1394) [0c00]: O2 Micro, Inc. Firewire (IEEE 1394) [1217:00f7] (rev 02)
	Kernel driver in use: ohci1394
	Kernel modules: firewire-ohci, ohci1394
08:05.2 SD Host controller [0805]: O2 Micro, Inc. Integrated MMC/SD Controller [1217:7120] (rev 02)
	Kernel driver in use: sdhci-pci
	Kernel modules: sdhci-pci
08:05.3 Mass storage controller [0180]: O2 Micro, Inc. Integrated MS/xD Controller [1217:7130] (rev 01)

output for sudo ifconfig -a

eth0      Link encap:Ethernet  HWaddr 00:21:70:c8:f5:2f  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)
          Interrupt:29 Base address:0x6000 

lo        Link encap:Local Loopback  
          inet addr:127.0.0.1  Mask:255.0.0.0
          inet6 addr: ::1/128 Scope:Host
          UP LOOPBACK RUNNING  MTU:16436  Metric:1
          RX packets:7836 errors:0 dropped:0 overruns:0 frame:0
          TX packets:7836 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:704880 (704.8 KB)  TX bytes:704880 (704.8 KB)

wlan0     Link encap:Ethernet  HWaddr 00:23:4e:3f:85:13  
          BROADCAST MULTICAST  MTU:1500  Metric:1
          RX packets:0 errors:0 dropped:0 overruns:0 frame:0
          TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:0 (0.0 B)  TX bytes:0 (0.0 B)

output for dmesg | grep Ethernet

[    1.149701] r8169 Gigabit Ethernet driver 2.3LK-NAPI loaded

[MikeTbob]

What happens when you try these commands?

sudo ifup eth0

sudo dhclient eth0

[shreyashukla]

And to the asked question, a friend of mine did pretty much the whole installation of ubuntu for me..so i guess he must've installed the ethernet driver when he was installing the essential drivers.
Oh and i must add one more thing, that i got ubuntu installed in a different place than i'm in right now. The person who helped me install it also told me to make some changes (when i change network) in the source list (i think i had to delete some mirror sources in there), which i did. When i returned to my permanent network, i had problems installing flash player, or even routine updating for that matter. It fails to fetch most of the links. Whenever i go back to that place (network), my laptop updates fine, and i even got my flash player on! But now i'm at my permanent place, and the net was working fine until i updated it..
do u think this is related to the problem?

P.S- thanks for helping me out..

[shreyashukla]

here's the output for sudo ifup eth0

Ignoring unknown interface eth0=eth0.

output for sudo dhclient eth0

There is already a pid file /var/run/dhclient.pid with pid 2548
killed old client process, removed PID file
Internet Systems Consortium DHCP Client V3.1.3
Copyright 2004-2009 Internet Systems Consortium.
All rights reserved.

Listening on LPF/eth0/00:21:70:c8:f5:2f
Sending on LPF/eth0/00:21:70:c8:f5:2f
Sending on Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 13
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 16
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 5
No DHCPOFFERS received.
No working leases in persistent database - sleeping.

[jayd512]

Is this computer connected to a modem? Or to a router?
Do this:

sudo rm /var/run/dhclient.pid

sudo dhclient eth0

As to your other question, could you tell us what steps you went through to 'change networks'? For a physical, wired connection you shouldn't need to change anything at all to connect to the Internet.

[shreyashukla]

ok i just found that my internet started working again! i think because the connection here fluctuates a lot, and people have set their systems to switch automatically to static I.P, i didn't get to know that net wasn't there only and it looked like everyone except me was getting internet. sorry for the trouble :P I still have that improper updating problem though.. and to your question, i just deleted 2 or 3 mirror sources (of the network where i installed linux in), from the source list. The sources referred to the name of that network, so i guessed it was only logical to do that.