Public bug reported:

Today, March 31, I updated my Natty installation. After reboot, the
network applet didn't show wifi anymore. Same happens after many
reboots. I can connect via a wired connection only.

The first time I rebooted I saw a message on screen while Ubuntu was
booting that said something about the network card. I don't remember
exactly what it said (it dissappeared quickly) and I couldn't find it in
the logs.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: linux-image-2.6.38-7-generic 2.6.38-7.39
Regression: Yes
Reproducible: Yes
ProcVersionSignature: Ubuntu 2.6.38-7.39-generic 2.6.38
Uname: Linux 2.6.38-7-generic i686
AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.23.
Architecture: i386
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC0:  pablo      1722 F.... pulseaudio
Card0.Amixer.info:
 Card hw:0 'Intel'/'HDA Intel at 0xfe9fc000 irq 46'
   Mixer name   : 'Silicon Image SiI1392 HDMI'
   Components   : 'HDA:83847616,1028020a,00100201 
HDA:10951392,1028020a,00100000'
   Controls      : 32
   Simple ctrls  : 20
CheckboxSubmission: 6d595a5759ac779c2dd93ffb6ae9a5db
CheckboxSystem: d00f84de8a555815fa1c4660280da308
Date: Fri Apr  1 05:24:58 2011
HibernationDevice: RESUME=UUID=033a937c-ed72-4cc3-84f7-59da85249ec0
MachineType: Dell Inc. XPS M1330
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: root=UUID=a880b37c-e0a4-4bd0-bf22-1e3efff131be ro quiet 
splash
RelatedPackageVersions:
 linux-restricted-modules-2.6.38-7-generic N/A
 linux-backports-modules-2.6.38-7-generic  N/A
 linux-firmware                            1.49
RfKill:
 0: dell-wifi: Wireless LAN
        Soft blocked: no
        Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to natty on 2011-03-25 (7 days ago)
WpaSupplicantLog:
 
dmi.bios.date: 09/03/2007
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A06
dmi.board.vendor: Dell Inc.
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.modalias: 
dmi:bvnDellInc.:bvrA06:bd09/03/2007:svnDellInc.:pnXPSM1330:pvr:rvnDellInc.:rn:rvr:cvnDellInc.:ct8:cvr:
dmi.product.name: XPS M1330
dmi.sys.vendor: Dell Inc.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 kernel-net natty needs-upstream-testing 
regression-release running-unity

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https://bugs.launchpad.net/bugs/747082

Title:
  No wifi after update

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