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.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to bcmwl in Ubuntu. https://bugs.launchpad.net/bugs/1774138 Title: wi-fi don't working in hp pavilion mini 300-020nf Status in bcmwl package in Ubuntu: New Bug description: The Linux STA driver from bcmwl-kernel source is not working. I'm using a USB-wi-fi adapter instead. Ubuntu 18.04 LTS ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: bcmwl-kernel-source 6.30.223.271+bdcom-0ubuntu4 ProcVersionSignature: Ubuntu 4.15.0-22.24-generic 4.15.17 Uname: Linux 4.15.0-22-generic x86_64 ApportVersion: 2.20.9-0ubuntu7 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Wed May 30 09:22:49 2018 InstallationDate: Installed on 2018-05-30 (0 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) SourcePackage: bcmwl UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/bcmwl/+bug/1774138/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp