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what i did was

 sudo apt-get purge network-manager network-manager-gnome

then i installed 'WICD'

it works and i dont have to sacrifice my N

cheers

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https://bugs.launchpad.net/bugs/836250

Title:
  [Oneiric] Intel Corporation Centrino Ultimate-N 6300 poor networking,
  packet loss and very slow Lenovo X201 and T500 laptops

Status in “linux” package in Ubuntu:
  Triaged
Status in “network-manager” package in Ubuntu:
  Confirmed
Status in “linux” source package in Oneiric:
  Triaged
Status in “network-manager” source package in Oneiric:
  Confirmed
Status in “linux” source package in Precise:
  Triaged
Status in “network-manager” source package in Precise:
  Confirmed

Bug description:
  This may be either network-manager or kernel, depending on triage...

  I have verified this on both a Lenovo X201 and a Lenovo T500 laptop.

  Both work perfectly with fully updated 10.10 and 11.04 versions of
  Ubuntu.

  However, booting into a fully updated 11.10 (as of 28/08/11) I get
  very poor wireless networking performance. Between 6-10% packet loss,
  very very slow connection and transfer rate. All in all, practically
  unusable.

  I have reported the bug on the X201 laptop, I will add the similar
  logs from the T500 also if required.

  As soon as I swap back to either 10.10 or 11.04 I get perfect
  wireless, it's only on 11.10 that I get problems, this would suggest
  it's not hardware or configuration on my side.

  I have had this since first installing 11.10 which was a little after
  Alpha 2.

  Wired connection is fine.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: network-manager 0.9.0-0ubuntu1
  ProcVersionSignature: Ubuntu 3.0.0-9.14-generic 3.0.3
  Uname: Linux 3.0.0-9-generic x86_64
  Architecture: amd64
  CRDA: Error: [Errno 2] No such file or directory
  Date: Sun Aug 28 21:26:05 2011
  EcryptfsInUse: Yes
  Gconf:
   
  IfupdownConfig:
   auto lo
   iface lo inet loopback
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
  IpRoute:
   default via 192.168.100.1 dev eth0  proto static 
   192.168.100.0/24 dev eth0  proto kernel  scope link  src 192.168.100.41
  Keyfiles: Error: [Errno 2] No such file or directory
  NetworkManager.state:
   [main]
   NetworkingEnabled=true
   WirelessEnabled=true
   WWANEnabled=true
   WimaxEnabled=true
  ProcEnviron:
   LANGUAGE=en_GB:en
   PATH=(custom, user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: network-manager
  UpgradeStatus: No upgrade log present (probably fresh install)

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