Linux does not have WiFi

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Title:linux No WiFi
Category: [Technology, safety]
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Introduction to the problem of WiFi in Linux

Several times to reload the Linux system, often there is no WiFi status

Error details

Previously installed Centos,kylin,opensu, and so on often appear no wifi situation, although speculation is a driver problem, but has not taken the time to try to solve.

Today again encountered this problem, and has been re-installed two times, has not been resolved, can only directly find solutions.

The current system is Ubuntu gnome 13.10, the PC is HP ProBook 6540b

Solution Solutions

2. DMESG | grep b43 (problem found)
   The DMESG is used to detect and control kernel buffering to help users understand the system's startup information.
   As shown in: The system prompts to the Linux Wireless download firmware, we directly click on the Linux Wireless, opened and found the old website to now have a copy of the old Content:old Lin UX Wireless, so we need to refer to the content on the old Linux Wireless. If the content is not displayed, refer to the previous article.

4. sudo apt-get install Firmware-b43-installer (not recommended, best downloaded via website)
   Download install B43-fwcutter because B43-fwcutter tool would extract firmware from the Windows driver
   We can choose to download directly from HTTP://BUES.CH/B43/FWCUTTER/B43-FWCUTTER-018.TAR.BZ2, the version 018 of B43-fwcutter, the file is downloaded by default in the download directory.

6. Download the corresponding driver according to the kernel version, refer to old Linux Wireless, two, according to my own version of the driver I am directly in http://www.lwfinger.com/b43-firmware/ broadcom-wl-5.100.138.tar.bz2 download. The downloaded files and B43-fwcutter are in the same directory.
   Next we go to the download directory, step 4567 is to unzip, compile and install B43-fwcutter, step 9,10 is to unzip and install the driver files.

8. Tar xjf b43-fwcutter-018.tar.bz2

10. CD b43-fwcutter-018

12. Make

14. sudo make install

16. Cd..

18. Tar xjf broadcom-wl-5.100.138.tar.bz2

20. sudo b43-fwcutter-w/lib/firmware broadcom-wl-5.100.138/linux/wl_apsta.o

22. Modprobe b43 (load b43 Drive)

24. sudo shutdown-r now

Done

Appendix

1. LSPCI-VV | grep Network (determines the type of wireless card)
   LSPCI displays all hardware features of the current host
   -V Displays details of the PCI interface appliance
   -VV displaying more detailed information on PCI interface devices
   | Pipeline
   grep network finds the line where the network keyword resides
   Or use the command here lspci-nn-d 14e4: (Note:)
2. UNAME-A (determine kernel version)

Finally WiFi display, finally can connect on the WiFi.

Description

Write this article as a note using Linux. The picture did not take another photo, but it did not happen again, but it did solve the problem.

Reference articles
Linux cannot connect to WiFi and does not display WIFI-CSDN blog
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Linux does not have WiFi