Hi, I am experiencing this issue as well but not with multiple OS's (yet) I ran lsusb from the terminal and I got the following...
Bus 001 Device 005: ID 413c:2107 Dell Computer Corp.
Bus 001 Device 004: ID 046d:c52b Logitech, Inc. Unifying Receiver
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514 Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
I'm pretty sure the bolded device is the WIFI adapter built in to the Pi3...
All the tutorials I've found have said to use WIFI Config which is supposably comes on the desktop (the only thing on my desktop when I first loaded it was the wastebasket). I tried looking for it in the toolbar but the dropdown from the up/down arrow looking icon says "no wireless interfaces found".
The next thing I did was run ls mod but I can't make sense of what it means. See below...
Module Size Used by
bnep 10340 2
hci_uart 17943 1
btbcm 5929 1 hci_uart
bluetooth 326105 22 bnep,btbcm,hci_uart
cfg80211 427855 0
rfkill 16037 3 cfg80211,bluetooth
evdev 11396 4
hid_logitech_hidpp 10382 0
hid_logitech_dj 10016 0
snd_bcm2835 20447 1
snd_pcm 75762 1 snd_bcm2835
snd_timer 19288 1 snd_pcm
snd 51908 5 snd_bcm2835,snd_timer,snd_pcm
bcm2835_gpiomem 3040 0
bcm2835_wdt 3225 0
I'm using Raspbian Jessie with pixel Kernel ver 4.4 which I got from
https://www.raspberrypi.org/downloads/raspbian/
Oh, and Yes I'm sure I have a Pi 3 and not 2 :)
Thanks for any suggestions, hopefully I'm overlooking something simple... :)