I recently install ElementaryOS and have spent hours trying to get wireless enabled. I have a Toshiba Satellite L55 and went into Bios and enabled wifi power. Any information you need to help me, I will provide. Thank you, I would really like to use ElementaryOS.
First of all check in terminal with command uname -a what kernel version do you have. If newer then ignore the solution below and download drivers from Intel provided in the second link.
Solution from here: Intel 8265 doesn't work in Loki
See if sudo apt-get install linux-generic-hwe-16.04-edge gets the 4.8 kernel installed and then do
wget http://mirrors.kernel.org/ubuntu/pool/main/l/linux-firmware/linux-firmware_1.161.1_all.deb sudo dpkg -i linux-firmware_1.161.1_all.deb
Also drivers from Intel can be downloaded here: Linux* Support for Intel® Wireless Adapters