Like the title, I updated the Raspbian from Jessie to Buster, and when I restarted my Pi 2 Model B, wlan0 suddenly not associated, I noticed that could be my Wifi dongle problem. But when I get to raspi-config in Terminal to change Wifi settings, it just threw me this error box "Could not communicate with wpa_supplicant"
P/S: Ethernet is still working properly,
Is this a system bug or just an error ? If that an error, how should I fix it ?
My Wifi dongle is TP-Link TP-WN725N Wireless N
Thank you ]1