I wanted to install Linux on a laptop so I had originally installed Ubuntu and everything was working well. The issue came about when I re-installed with my preferred distro Linux Mint; as I prefer the cinnamon desktop vastly over Ubuntu’s Unity.
The fix turned out to be fairly simple. The steps needed are as follows:
1. Downloaded the ucode for my Intel wifi device (3165) with 3.19+ kernel (https://wireless.wiki.kernel.org/_me…184.108.40.206.tgz) fromhttps://wireless.wiki.kernel.org/en/…rivers/iwlwifi
2. Renamed and copied the downloaded ucode files into /lib/firmware
sudo cp Download/iwlwifi-7265D-12.ucode /lib/firmware/iwlwifi-3165-9.ucode
sudo cp Download/iwlwifi-7265-12.ucode /lib/firmware/iwlwifi-3165-12.ucode
Job sorted. Found via the excellent ubuntu forums: