Hello, I have similar problem.
On my Vostro 1015 the Dell Wireless 1397 WLAN mini card, WiFi works well in 
Windows. It worked well into ubuntu 10. After upgrading on 14.04 a year ago, 
works only in wired condition. I have do everything described above, bu no 
result. What can I do now, plwase?

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to bcmwl in Ubuntu.

  bcmwl-kernel-source bcmwl kernel module
  failed to build

Status in bcmwl package in Ubuntu:

Bug description:
  just happened...no idea why

  ProblemType: Package
  DistroRelease: Ubuntu 14.04
  Package: bcmwl-kernel-source
  ProcVersionSignature: Ubuntu 3.13.0-89.136-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-89-generic i686
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu3.21
  Architecture: i386
  DKMSKernelVersion: 4.4.0-26-generic
  Date: Tue Jun 21 23:28:52 2016
 error: implicit declaration of function ‘rdtscl’ 
  InstallationDate: Installed on 2015-10-16 (249 days ago)
  InstallationMedia: Ubuntu MATE 14.04.2 "Trusty Tahr" - LTS i386 (20150323)
   dpkg 1.17.5ubuntu5.7
   apt  1.0.1ubuntu2.14
  SourcePackage: bcmwl
  Title: bcmwl-kernel-source bcmwl kernel module 
failed to build
  UpgradeStatus: No upgrade log present (probably fresh install)

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