Fix zd1211 Firmware Error -2 on Raspberry Pi

When plugging the TP-link TL-WN422G the following error is shown on dmesg Could not load firmware file zd1211/zd1211b_ub. Error number -2

VirtualBox: ath9k_htc Failed to Initialize

Virtual Guest return the error ath9k_htc: Target is unresponsive on dmesg log, this article explains how to solve it.

isl3887usb Firmware Load Failed Error -2 Fix

Quick fix for using wusb54ag on raspian

Error wireless request "Set Mode" (8B06): Device Busy — Fix

Fix "error for wireless request Set Mode (8B06): SET failed on device wlan0; Device or resource busy". Kill wpa_supplicant and NetworkManager before enabling monitor mode in Kali Linux.

Improving WiFi performance on Linux LEDE