I've run into this same problem with the same wifi chipset. Bus 001 Device 002: ID 0bda:8172 Realtek Semiconductor Corp. RTL8191SU 802.11n WLAN Adapter I'm on kernel 3.17.0-kirkwood-tld-1 which seems to be missing headers so I can't make the driver. If I put the r8712u.ko module in /lib/modules/3.17.0-kirkwood-tld-1/kernel it doesnt' solve the problem:by whalphen - Debian