i installed ubuntu 10.04 after installing vista.but wired connection is not working..wired connection option at network icon at the desktop at the panel is faded.so i am not able to set ip address manually...plz tell me any solution.

You will need to find out what your network hardware is. Open a terminal and type 'lspci' and ENTER. Post the information you see on network chips so we know what you have. Then we can see if ubuntu has the driver for it.

....actually this problem came when i installed ubuntu 10.10.immediately installing vista home basic..i thought this problem may be by wrong installation of operating system..i changed it to 10.04..but problem persisted..while at start up "serial number is missing" comes at splash screen of hp invent(place where "press esc for startup menu" comes)..i don't know whether these problems are connected with each other..but my lan net is working in vista..
output of lspci:
00:00.0 Host bridge: Intel Corporation Mobile 4 Series Chipset Memory Controller Hub (rev 07)
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
00:1a.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #4 (rev 03)
00:1a.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #5 (rev 03)
00:1a.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #2 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801I (ICH9 Family) HD Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 1 (rev 03)
00:1c.1 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 2 (rev 03)
00:1c.2 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 3 (rev 03)
00:1c.3 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 4 (rev 03)
00:1c.4 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 5 (rev 03)
00:1c.5 PCI bridge: Intel Corporation 82801I (ICH9 Family) PCI Express Port 6 (rev 03)
00:1d.0 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #1 (rev 03)
00:1d.1 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #2 (rev 03)
00:1d.2 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #3 (rev 03)
00:1d.3 USB Controller: Intel Corporation 82801I (ICH9 Family) USB UHCI Controller #6 (rev 03)
00:1d.7 USB Controller: Intel Corporation 82801I (ICH9 Family) USB2 EHCI Controller #1 (rev 03)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev 93)
00:1f.0 ISA bridge: Intel Corporation ICH9M LPC Interface Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation ICH9M/M-E SATA AHCI Controller (rev 03)
00:1f.3 SMBus: Intel Corporation 82801I (ICH9 Family) SMBus Controller (rev 03)
00:1f.6 Signal processing controller: Intel Corporation 82801I (ICH9 Family) Thermal Subsystem (rev 03)
02:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g (rev 01)
03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)....
i also installed various ethernet driver
used following commond
modprobe atl1c
all driver of atl1,atl1e,atl2..
these driver are given in

Sorry it took so long to get back to you. I finally got a chance to check my system out on wired connection. I wanted to do that, because I have the same ethernet as you do. The wired worked for me; so I'm thinking you have the wrong driver. I've never used my wired and didn't have to do anything special to get it going. It could be that I have some package installed that you do not, but I don't know what it would be. I see that you were trying some wrong drivers. Mine shows it using r8169 My kernel is 2.6.32-29-generic and I've got Ubuntu lucid which is 10.04

From lspci -vv:

02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8101E/RTL8102E PCI Express Fast Ethernet controller (rev 02)
Subsystem: Toshiba America Info Systems Device ff1e
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 32 bytes
Interrupt: pin A routed to IRQ 27
Region 0: I/O ports at 4000 [size=256]
Region 2: Memory at d0410000 (64-bit, prefetchable) [size=4K]
Region 4: Memory at d0400000 (64-bit, prefetchable) [size=64K]
Expansion ROM at d0420000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: r8169
Kernel modules: r8169