I met an issue while I was installing the Debian 8. It pops up that The missing firmware files are: iwlwifi-8000-8.ucode. I've searched Google and it stated that it is due to the driver being a "non-free" driver for Intel Wireless AC 8260.
I've also notice that I can get the latest driver build at the link below. http://git.kernel.org/cgit/linux/kernel/git/firmware/linux-firmware.git/
But I can not find the exact same .ucode. Is this something I can build from source or any other hint for that?
Answer
Your post is a bit of a puzzle. First, the reference you give is totally irrelevant, it concerns Broadcom's cards, not Intel's.
With that out of the way, I am puzzled that you should need version 8 of the microcode: according to the Linux Kernel Wireless page, AC-8260 is available from kernel 4.1 onward, and it requires the microcode versions 13 and on. If you have a kernel 4.1 or later, you are done: download the firmware file from the link above, unwrap it, and place it where needed:
mkdir tmp
cd tmp
wget https://wireless.wiki.kernel.org/_media/en/users/drivers/iwlwifi-8000-ucode-25.30.13.0.tgz
gunzip iwlwifi-8000-ucode-25.30.13.0.tgz
tar xvf iwlwifi-8000-ucode-25.30.13.0.tar
cp iwlwifi-8000-ucode-25.30.13.0/iwlwifi-8000C-13.ucode /lib/firmware
If you have an older kernel, you should definitely update it, there is no good reason for keeping one so outdated. If you cannot do that, you will have to install iwlwifi from the kernel backports. But we'll cross that bridge when we get there.
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