After upgrade, my hardware switch for wifi (accessed by Fn + function
key) stopped working. But, all other function keys to control display
brightness, volume, mute have been working fine.

There are some pages on which discuss the same problem
that I have. But, they talk about re-installing broadcom drivers, etc. I
checked mine and I seem to have a qualcomm device instead of broadcom.
See below:

~$ lspci -vnn | grep Network
06:00.0 Network controller [0280]: Qualcomm Atheros QCA9565 / AR9565 Wireless 
Network Adapter [168c:0036] (rev 01)
        Subsystem: Dell QCA9565 / AR9565 Wireless Network Adapter [1028:020c]

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  wifi broke after 16.04 upgrade

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