[ubuntu] After upgrade to 16.04, WIFI doesn't work: Shall I disable UEFI Secure Boot?

Hi all,
I upgraded from Ubuntu 14.04 to 16.04, and the process got stuck (see details here: http://ift.tt/29NDLaE). My laptop is a Lenovo B590
I then decided to re-install from scratch with a DVD, but I didn't format /Home.

I'm having different problems, and WIFI doesn't work.

I've followed instructions from this thread (http://ift.tt/29NDjcu), but it still doesn't work. I've looked also some others, but this time decided to ask for advice before I mess up again.
http://ift.tt/29NDUeg
http://ift.tt/29NDTqD

Once I run

Code:

 sudo apt-get install --reinstall bcmwl-kernel-source

, I get the following message

Code:

 Your system has UEFI Secure Boot enabled. UEFI Secure Boot is not compatible with the use of third-party drivers.                      │ 
  │                                                                                                                                        │ 
  │ The system will assist you in disabling UEFI Secure Boot. To ensure that this change is being made by you as an authorized user, and   │ 
  │ not by an attacker, you must choose a password now and then use the same password after reboot to confirm the change.                  │ 
  │                                                                                                                                        │ 
  │ If you choose to proceed but do not confirm the password upon reboot, Ubuntu will still be able to boot on your system but these       │ 
  │ third-party drivers will not be available for your hardware.                                                                           │ 
  │                                                                                                                                        │ 
  │ Disable UEFI Secure Boot?

Shall I choose Yes or No? Meaning, Shall I disable UEFI Secure Boot?

Thanks for your help

Some more info:

Code:

jhonny@Jhonny-Lenovo-B590:~$ lspci -knn | grep Net -A2
02:00.0 Network controller [0280]: Broadcom Corporation BCM43142 802.11b/g/n [14e4:4365] (rev 01)
        Subsystem: Lenovo BCM43142 802.11b/g/n [17aa:0611]
        Kernel modules: bcma, wl
jhonny@Jhonny-Lenovo-B590:~$

Code:

jhonny@Jhonny-Lenovo-B590:~$ sudo apt-get install bcmwl-kernel-source
Reading package lists... Done
Building dependency tree       
Reading state information... Done
bcmwl-kernel-source is already the newest version (6.30.223.248+bdcom-0ubuntu8).
0 upgraded, 0 newly installed, 0 to remove and 33 not upgraded.
jhonny@Jhonny-Lenovo-B590:~$

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[ubuntu] After upgrade to 16.04, WIFI doesn't work: Shall I disable UEFI Secure Boot?