wlan0 is missing

Question

My laptop wlan0 missing after apt-get upgrade. It works well before. ifconfig only lists lo and eth0 now. iwconfig give no wireless extension error.

$ iwconfig
lo     no wireless extensions.
eth0   no wireless extensions.

I can see the Network controller of wlan is "Intel Corporation PRO/Wireless 2200BG" by the command lspci -nn, I have already tried rfkill unblock all with no luck. ifconfig wlan0 up returns wlan0: Error while getting interface flags: no such device error. My Ubuntu is 14.04. Please help.

Update:

$ lspci -knn | grep Net -A2
06:05.0 Network controller [0280]: Intel Corporation PRO/Wireless 2200BG [Calexico2] Network Connection [8086:4220] (rev 05)
    Subsystem: Intel Corporation WM3B2300BG Mini-PCI Card [8086:2701]
06:07.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL-8100/8101L/8319 PCI Fast Ethernet Adapter [10ec:8139] (rev10)

Solution

The easiest way is to upgrade kernel. Run in terminal

sudo apt-get install linux-generic-lts-vivid

and reboot after installation finishes.

But you have to be connected to internet by wire or a USB dongle.

If it is not easy, you can try to boot with a previous kernel using grub menu.

Comments

[Pilot6]

Please edit your question and add output of lspci -knn | grep Net -A2 terminal command.

[Pilot6]

What is Ubuntu version? What kernel version uname -r?

[TRX]

Ubuntu version is 14.04 LTS, uname -r returns 3.13.0-58-generic

[chili555]

Is there any informative clue when you load the driver? sudo modprobe ipw2200 and then: dmesg | grep ipw Welcome to askubuntu.

[TRX]

sudo modprobe ipw2200 returns modprobe: FATAL: Module ipw2200 not found. dmesg | grep ipw returns nothing. I don't know, the driver works before, Does this mean I should reinstall the driver? How to do it? Thanks.

[A.B.]

Ha, the kernel hacker :)