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I recently installed a Linksys Wireless-N Notebook Adapter w/Dual-Band (WPC600N), which is working nicely via the PCMCIA slot; however, I cannot find where to permanently disable the internal WiFi adapter. Currently, I'm forced to manually disable it with each reboot.

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Is there a BIOS setting you can switch? – zpletan Mar 27 '12 at 3:15
Possible duplicate of How enable/disable WiFi adapters individually under 10.04 – Wilhelm Erasmus Dec 9 '15 at 23:39

Unless there is a hardware switch to turn it off, just blacklist the module.

You can find out which module is in use with this:

lspci -nnk | grep -iA2 net blacklist a module, add blacklist module_name to /etc/modprobe.d/blacklist.conf

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Thanks for the information. Being an old DOS hack, I was able to figure out what changes to make and where to make them, but I've been unable to save them to the blacklist.conf file. i don't seem to have permission to modify the file. Any comments? – Stan Haskell Mar 30 '12 at 8:09
You have to open it with super user privileges, like this: gksudo gedit /etc/modprobe.d/blacklist.conf. If you need help with the module names, post the output of lsmod. – mikewhatever Mar 30 '12 at 10:22
Thanks mikewhatever, I'll give that a whirl. Hopefully, there won't be any follow-up questions. I appreciate your time. – Stan Haskell Apr 2 '12 at 22:21

Add the following line to /etc/network/interfaces:

iface wlan0 inet manual

(Replace wlan0 with the interface you want to disable)

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