solved using this ...thanx!

Fix for slow wireless for HP dm4 Intel Centrino card in 12.04 Wubi
I am using an HP dm4t (dm4x) and the wireless fix I used for 11.10 did not work 
in 12.04 LTS. I didn't figure this out myself but found this online on a 
different forum and wanted to post it up here because this is what finally 
worked for me. It may already be somewhere else but it never hurts to put it up 
for the noobs.

Open the terminal and type the following two lines:

sudo rmmod iwlwifi
sudo modprobe iwlwifi 11n_disable=1

If it works make it permanent by typing the following line in the
terminal:

gksudo gedit /etc/modprobe.d/iwlwifi-disable11n.conf

A file will be opened. At the end of the file, paste the following line
then save:

options iwlwifi 11n_disable=1

Then save and quit and you should be good to go. The notes the person
had posted said "at the end of the file" but my file didn't have any
script to paste this at the end of. I just pasted it their by itself and
it seemed to work anyway.

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to network-manager in Ubuntu.
https://bugs.launchpad.net/bugs/1002084

Title:
  NM shows connection but there is no connectivity

Status in “network-manager” package in Ubuntu:
  New

Bug description:
  after fresh install on 64 bit vaio, network manager shows connection
  but I am able update, firefox does not work, saying server in not
  found. Using ubuntu software center the progress just locks. 12.04
  fresh install.  Tried commenting out as per forum recommends. But
  still no net.

  Thanx

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/network-manager/+bug/1002084/+subscriptions

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