I have two OS in my Dell vostro laptop - Windows XP and Ubuntu 10.04.
In XP, the wireless is working fine, but in Ubuntu, it is not working. I have checked the wirless driver from System -> Hardware Drivers, it is installed and is in active state. The wired network is working fine. When I tried to connect to the wireless, it says, Connected. Even the wireless shows that the wireless is connected. But I can't load any page. Whenever I tried to browse, it says, Page can't be displayed, check your network connection. I have tried various method found in google, but no result.
Any suggession is appreciated.
I have just migrated from Windows so can't figure out the problem.

your wireless is not working. kindly make sure that kudzo service is running in ur Ubuntu? this service use to detech new hardware so on ur wireless and then run this servise.

In order to get to reason why ur wireless does not work.

Please get output of dmesg with dmesg, because sometimes you miss wireless firmware.

Also, check for ur wireless chipset, so we know it can work in Ubuntu? You can use lspci.
e.g Ubuntu system with Broadcom

$lspci | grep -i broadcom
$02:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)

$lspci -v -s 02:00.0
$02:00.0 Network controller: Broadcom Corporation BCM4312 802.11b/g LP-PHY (rev 01)
Subsystem: Hewlett-Packard Company BCM4312 802.11b/g Wireless LAN Controller
Flags: bus master, fast devsel, latency 0, IRQ 18
Memory at 58500000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: wl
Kernel modules: wl, ssb

You can take a look at these:
http://linuxwireless.org/en/users/Download
https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx
https://help.ubuntu.com/community/WifiDocs/Driver/bcm43xx

Hope this help.

kindly make sure that kudzo service is running in ur Ubuntu? this service use to detech new hardware so on ur wireless and then run this servise. go to linuswireless

kindly make sure that kudzo service is running in ur Ubuntu? this service use to detech new hardware so on ur wireless and then run this servise. go to linuswireless

There is no kudzu in ubuntu. Kudzu is a redhat thing.

Please run the lspci command so we can see what model your wireless NIC is.