Wi-Fi help.

[Linux for blind general discussion]

Hi, Willem here.
I have not used wpa_cli, but if your 
/etc/wpa_supplicant/wpa_supplicant.conf has a valid network block, you can 
look at your /etc/network/interfaces to see what the entry for wlan0 looks 
like and then take it from there.
By the sound of it, you might not have a configuration for wlan0 in there.
If so, add something like the below to /etc/network/interfaces and then 
try
ifup wlan0



iface wlan0 inet dhcp
pre-up wpa_supplicant -iwlan0 -B -c/etc/wpa_supplicant/wpa_supplicant.conf
post-down killall -q wpa_supplicant
auto wlan0
HTH, Willem


On Sun, 7 Jan 2018, Linux for blind general discussion wrote:

> Following the guide at
> https://www.raspberrypi.org/documentation/configuration/wireless/wireless-cli.md,
> I successfully got my Raspberry Pi 3 running a near stock Raspbian
> Stretch Lite connected to my wireless network. Copying
> /etc/wpa_supplicant/wpa_supplicant.conf and running wpa_cli -i wlan0
> reconfigure, I repeated this on my Raspbery Pi 2 using a USB Wi-Fi
> dongle without any effort.
>
> Now, I'm trying to repeat this on a desktop that has Wi-Fi onboard
> with much less success. I installed wpasupplicant and wireless-tools
> via Aptitude, copied over the wpa_supplicant.conf file, and ran
> wpa_cli -i wlan0 reconfigure to recieve the following error message:
>
> Failed to connect to non-global ctrl_ifname: wlan0  error: No such
> file or directory
>
> And running iwconfig produces the following output:
>
> wlan0     IEEE 802.11  ESSID:off/any
>          Mode:Managed  Access Point: Not-Associated   Tx-Power=0 dBm
>          Retry short limit:7   RTS thr:off   Fragment thr:off
>          Power Management:off
>
> Neither of which is all that helpful, especially since the above
> mentioned successes with Raspberry Pis are the only successes I've
> ever had connecting a Linux machine to a wireless network.
>
> So, any ideas as to what I'm doing wrong?
> -- 
> Sincerely,
>
> Jeffery Wright
> President Emeritus, Nu Nu Chapter, Phi Theta Kappa.
> Former Secretary, Student Government Association, College of the Albemarle.
>
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