can not connect throught local

can you open a shell and run "ifconfig -a" (without the ampersand) and post the results here ?

kevin@kevin-laptop:~$ ifconfig -a
irda0 Link encap:IrLAP 硬件地址 00:00:00:00
          NOARP MTU:2048 跃点数:1
          接收数据包:0 错误:0 丢弃:0 过载:0 帧数:0
          发送数据包:0 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:8
          接收字节:0 (0.0 B) 发送字节:0 (0.0 B)

lo Link encap:本地环回
          inet 地址:127.0.0.1 掩码:255.0.0.0
          inet6 地址: ::1/128 Scope:Host
          UP LOOPBACK RUNNING MTU:16436 跃点数:1
          接收数据包:7804 错误:0 丢弃:0 过载:0 帧数:0
          发送数据包:7804 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:0
          接收字节:290702 (283.8 KB) 发送字节:290702 (283.8 KB)

wlan0 Link encap:以太网 硬件地址 00:1b:77:08:d3:71
          inet 地址:192.168.1.2 广播:192.168.1.255 掩码:255.255.255.0
          inet6 地址: fe80::21b:77ff:fe08:d371/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST MTU:1500 跃点数:1
          接收数据包:100847 错误:0 丢弃:0 过载:0 帧数:0
          发送数据包:90203 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:1000
          接收字节:116259438 (110.8 MB) 发送字节:10380512 (9.8 MB)

wmaster0 Link encap:未指定 硬件地址 00-1B-77-08-D3-71-00-00-00-00-00-00-00-00-00-00
          UP BROADCAST RUNNING MULTICAST MTU:1500 跃点数:1
          接收数据包:0 错误:0 丢弃:0 过载:0 帧数:0
          发送数据包:0 错误:0 丢弃:0 过载:0 载波:0
          碰撞:0 发送队列长度:1000
          接收字节:0 (0.0 B) 发送字节:0 (0.0 B)

kevin@kevin-laptop:~$

Also on the network setting

There is only wireless connection and modem connection, but there is no wired connection.

Please copy and paste here the result of lspci command...?

- Open a Terminal from the menu Applications->Accessories->Terminal and type:

lspci

lspci is the lower of LSPCI

Thank you

kevin@kevin-laptop:~$ lspci
00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
00:01.0 PCI bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express PCI Express Root Port (rev 03)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 02)
00:1c.2 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 3 (rev 02)
00:1c.3 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 4 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02)
00:1f.2 SATA controller: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA AHCI Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 02)
01:00.0 VGA compatible controller: ATI Technologies Inc M52 [Mobility Radeon X1300]
02:00.0 Ethernet controller: Intel Corporation 82573L Gigabit Ethernet Controller
03:00.0 Network controller: Intel Corporation PRO/Wireless 3945ABG Network Connection (rev 02)
15:00.0 CardBus bridge: Texas Instruments PCI1510 PC card Cardbus Controller
kevin@kevin-laptop:~$

The Intel NIC seems to have some driver problems, see this bug:
https://bugs.launchpad.net/ubuntu/+bug/226906/