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So I just recently installed Debian 8.6.0 Jessie and I've been having issues with wireless connection. My device can't detect wlan0 and I'm not really sure what to do about this.

When I do ifconfig -a it only shows eth0 and lo

then when i do iwconfig

    lo        no wireless extensions.

    eth0     no wireless extensions.

Sorry for the lack of information on here, I'm fairly new to using Debian and linux in general so I'm not sure what else i can put to show more info about this.

(EDIT) i did ip link show and all i got for the output was

    1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default
        link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT group default qlen 1000
        link/ether 20:25:64:c9:50:a5 brd ff:ff:ff:ff:ff:ff

I also have the following info about the hardware I'm using on here (note: I am using a Toshiba Satellite S55 Series Laptop if that helps)

I also did dmesg and as I looked through it i saw that there were errors in it (I'll paste the notable ones I've seen)

    [   10.817152] rtl8188ee: Using firmware rtlwifi/rtl8188efw.bin
    [   10.841926] rtl8188ee 0000:02:00.0: firmware: failed to load rtlwifi/rtl8188efw.bin (-2)
    [   10.841927] rtl8188ee 0000:02:00.0: Direct firmware load failed w
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    What wifi hardware do you use? PCI -> output of lspci, USB -> output of lsusb. Does dmesg show anything suspicious after booting wrt. to the WLAN device? (In doubt, put the completely output in a pastebin etc. and give a link).
    – dirkt
    Jan 9 '17 at 20:34
  • Try ip link show and make sure the device is available. If so, then check its state, as it may be DOWN.
    – wesley
    Jan 9 '17 at 20:38
  • I second dirkt. You need to determine exactly what WIFI hardware your computer has. Given that the rtl8188ee driver attempted to do something, you may have a Realtek device. If that's so, do as andreastsh suggested to install the firmware (it's not installed by default). See wiki.debian.org/rtl819x Jan 10 '17 at 0:44
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I'm using a Toshiba Satellite too, and I'm a Debian user.

When I installed it I had to download the necessary drivers for my hardware.

First edit your file /etc/sources.list to include the non-free component. An example of /etc/sources.list is:

deb http://httpredir.debian.org/debian/ jessie main contrib non-free
deb http://httpredir.debian.org/debian/ jessie-updates main contrib non-free
deb http://security.debian.org/ jessie/updates main contrib non-free

Then you have to run:

apt-get update 
apt-get install firmware-realtek

This package contains the driver rtl8188efw.bin which as you can see from your dmesg error messages it fails to load on boot.

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