Cannot access wifi since upgrading to 15.4

[KingOfMarchwood]

Since upgrading to 15.4 i've struggled to get wifi working.

Any help, steps...

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: linux-image-3.19.0-26-generic 3.19.0-26.27
ProcVersionSignature: Ubuntu 3.19.0-26.27-generic 3.19.8-ckt4
Uname: Linux 3.19.0-26-generic i686
ApportVersion: 2.17.2-0ubuntu1.2
Architecture: i386
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC0D0p: bob 1233 F...m pulseaudio
 /dev/snd/controlC0: bob 1233 F.... pulseaudio
CurrentDesktop: Unity
Date: Fri Jul 31 18:15:16 2015
HibernationDevice: RESUME=UUID=ddb44b1b-f5b4-4f79-96c5-b71ffe620493
InstallationDate: Installed on 2015-07-25 (6 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release i386 (20150422)
MachineType: LENOVO 766734G
PccardctlIdent:
 Socket 0:
   no product info available
PccardctlStatus:
 Socket 0:
   no card
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-26-generic root=UUID=616756ce-a08b-48cb-b95c-825dc50639b2 ro quiet splash vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-26-generic N/A
 linux-backports-modules-3.19.0-26-generic N/A
 linux-firmware 1.143.2
SourcePackage: linux
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/22/2007
dmi.bios.vendor: LENOVO
dmi.bios.version: 7NET29WW (1.10 )
dmi.board.name: 766734G
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr7NET29WW(1.10):bd10/22/2007:svnLENOVO:pn766734G:pvrThinkPadX61s:rvnLENOVO:rn766734G:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 766734G
dmi.product.version: ThinkPad X61s
dmi.sys.vendor: LENOVO

[Brad Figg (brad-figg)]

This change was made by a bot.

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.2 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.2-rc4-unstable/

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]