Comment 2 for bug 1774138

The problem has been solved.
I have read information from Ubuntu forums and found that the problem was that "sudo modprobe wl" couldn't work because the Secure boot in BIOS.
After disabling the Secure Boot, I was able to run "sudo modbprobe wl" and wi-fi begun work.
In reality I run the command:
sudo apt-get --reinstall install bcmwl-kernel-source
but may be was not necessary, may be the problem was only the Secure Boot, but I don't understand so much these things.
Thanks for the help, Ubuntu. Without the information in internet, shouldn't be possible for me to eliminate Windows from my computers.