networking - Wireless issue on Lenovo Thinkpad L540

I recently installed Ubuntu 13.10 on my Lenovo Thinkpad L540. It has problem with the wifi connection. When just booted it works then suddenly it drops the connection and cannot even see the wifi networks.

• I tried to install the windows driver for the wireless card Intel 7260 but I'm not able to extract the .inf file from the .exe that I download from Intel website. With the .inf file I should then be able to install the driver using ndiswrapper but, since I cannot get the .inf file, this way is gone.




• I tried also following other ways. I upgraded the Kernel to the 3.13 from 3.11 but still it doesn't work.




• I tried also to follow instructions such as those from Intel wireless 7260 driver crashes, how do I work around it? but every time I give the command sudo modprobe -r iwlwifi I get:

  
  
  
  

  
  

  FATAL: Module iwlwifi is in use.

  
  

6-April-EDIT:

• The command sudo modprobe -rf iwlmvm before sudo modprobe -r iwlwifi, doesn't change the situationi. Still the output to the second command is

  
  
  
  

  
  

  FATAL: Module iwlwifi is in use.

  
  




• The output to uname -r is

  
  
  

  
  

  3.13.1-031301-generic

  
  




• The output to dmesg | grep iwl is a long list made of elements like the following

  
  
  
  

  
  

  [ 2028.111303] iwlwifi 0000:02:00.0: L1 Enabled; Disabling L0S

  
  

  
  
  

  plus some few exception lines which give

  
  
  

  
  

  [ 2031.232825] iwlwifi 0000:02:00.0: RF_KILL bit toggled to enable radio.