i have 2 unifi ac mesh ap i upgrade it to 18.06.1 with sysupgrade when its finish i get
this error nl80211 not found. and wireless didnt work on these 2 device when i test interface list with ifconfig i cant see each wlan0 , wlan1 .
Maybe you need to reinstall
libiwinfo - 2018-07-24-94b1366d-1 - Wireless information library with consistent interface for proprietary Broadcom, nl80211 and wext driver interfaces.
Packages installed after the firmware upgrade are not preserved after the flashing of a new firmware.
Nice sound , I test it same things , other things if I need to reset it to ubnt stock firmeware through tftp it's didn't work and when I insert it in recovery mode with hard reset button and ping to ubnt defult IP 192.168.1.20 there's no response ?!!!
Maybe it would be a better idea to start a new topic regarding rolling back to stock firmware.
Other than that, do you want to continue troubleshooting the wlan issue here?
I think It's same I need go to stock to re-falsh it with openwrt to solve this problem because I get it after I upgrade but if it solve without go back to stock it's good