(Note: I posted this problem in a "Solved" thread of a very similar issue but received no responses, so I'm posting it as a new topic here.) I just installed Debian 9 stretch on a Sony laptop Z series (that originally had windows 7 pro), and the wifi doesn't work. I can't even see any setting for wifi control (in the cinnamon desktop environment). Specifically,
1) There is no wireless icon (desktop tray) in the lower RHS of the screen (see photo). -Unless the wireless info comes as part of the wired network desktop tray.
2) My network manager sees no wifi networks around (there should be many near where my laptop is located). See photo. It looks as though the wifi network manager doesn't see any wireless network hardware even. (Note: I have my physical wireless switch on the laptop turned "on").
When I did an lspci command, I got the following as a network controller, which I assume is the same as the wifi controller.
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network controller: Intel Corporation Centrino Advanced-N 6200 (rev 35)
Anyway, here's what I did so far:
I added the following to my sources.list:
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deb http://security.debian.org stretch/updates main contrib non-free
deb http://httpredir.debian.org/debian stretch main contrib non-free
deb http://httpredir.debian.org/debian stretch-updates main contrib non-free
deb-src http://httpredir.debian.org/debian stretch main contrib non-free
deb-src http://httpredir.debian.org/debian stretch-updates main contrib non-free
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# apt-get update
# apt-get install firmware-ipw2x00 wireless-tools
Thanks!
https://photos.app.goo.gl/XL4ny9lE1S6yxXIz1
https://photos.app.goo.gl/BoIU44gb00Euwmi72