« Last post by rsutter on July 11, 2014, 09:43:05 AM »
Last night I updated Ubuntu 14.04 64 bit version. It is installed on an HP Pavilion m6 laptop with multiple partitions. Other installations include Windows 8.1 and Linux Mint 17 64 bit.
Midway through the update, I lost my WiFi connection and couldn't regain it. I completed the install by plugging in an Ethernet cable.
When I rebooted the computer, I noticed that the light on the F12 key (turn WiFi on or off) was red, indicating that WiFi was turned off. Pushing that key did not turn WiFi on.
I booted into Windows 8.1 and ran the troubleshooting diagnostics. It reported that the WiFi was turned off and suggested that I turn it back on. Such advise is reminiscent of the thought-challenged individuals who indicate that you can easily put four elephants in a VW Beetle. Just put two in the front seats and two in the back seats.
I finally got WiFi back by going in to the BIOS setting and loading the Setup Defaults.
Here's how to do that.
Turn off the computer
Turn on the computer, pressing the ESC key repeatedly.
This will bring up the BIOS Startup Menu.
Press F10 (BIOS Setup)
Press F9 (Setup Defaults
Press F10 (Save and Exit)
Reboot the computer
For me, this series of actions brought back the F12 key (Turn WiFi on/off)
I booted into Windows 8.1 and chose my WiFi connection. (I had to reenter the security password.)
When I booted into Ubuntu 14.04, the F12 key once again turned red and I could not connect to WiFi.
Rebooting into Windows 8.1, the F12 button stayed red.
By chance, I discovered that the Ubuntu 14.04 software update had spontaneously set the WiFi connection to Airplane mode
Once that I switched out of Airplane mode I was able to turn on WiFi, the F12 key glowed white, mirroring my radiant smile.
Here is how to turn off Airplane Mode in Ubuntu 14.04
Go to System Settings/Network
Move the Airport Mode slider to the Off position (See attachment)