I am new to Ubuntu/Linux, this is my first ever install. Have installed Ubuntu 14.04 on an old HP Probook 5310m & a HP 431. I installed it from USB stick and overwrote Windows 7.
Everything looks good EXCEPT, WiFi doesn't work on either computer. On the Probook, the hard WiFi button on the right of the keyboard is orange (meaning off). Pressing it doesn't help. The system doesn't even seem to see that the pc has a WiFi adapter. On the HP 431, the WiFi is on the F12 key, but no combination of buttons will turn it green (constantly orange).
I've tried running
rfkill unblock all in the terminal, but am unsure if I did correctly (how can I tell if I'm "running as root"?). Anyway, didn't help, still no WiFi and orange button.
Also tried the "take battery out, reboot, F10" suggestion above. Didn't help, there was no options in the BIOS setup that seemed to be related to WiFi state.
Interestingly, on the Probook, if I go to "Settings/Network" pressing the WiFi switch seems to turn on and off Airplane mode, but still no WiFi with or without airplane mode being pressed. On the 431 it at least sees there is a WiFi adapter, but under the wireless sign, "WiFi is disabled" is shown but is grey and can't be changed. When I go into settings, it won't let me turn on the WiFi...
Can anyone help? I can supply more information, but you may need to instruct this noob into how to get it.