The Realtek 8188GU is a ubiquitous chipset found in hundreds of "Nano" USB WiFi adapters. It is the unbranded chip inside many generic USB dongles sold on Amazon, eBay, and AliExpress.
| Issue | Likely Cause | Solution | |-------|--------------|----------| | Driver compiles but no Wi-Fi interface | Conflicting rtl8xxxu driver | Blacklist it (see above), reboot | | Connection drops frequently | Power management enabled | sudo iwconfig wlan0 power off | | Slow speeds (≤10 Mbps) | USB autosuspend or 40 MHz disabled | echo 'options 8188gu rtw_switch_usb_speed=1' > /etc/modprobe.d/8188gu.conf | | Monitor mode not working | Driver limitation | Use aircrack-ng fork of driver | | Kernel panic on suspend/resume | Bug in driver | Unload module before suspend: create systemd script | | “Device or resource busy” | Interface already up | sudo ip link set wlan0 down then retry | realtek 8188gu wireless lan 80211n usb nic driver
| Feature | Details | |---------|---------| | | IEEE 802.11b/g/n | | Maximum speed | 150 Mbps (1x1 MIMO, 20 MHz/40 MHz channels) | | Frequency band | 2.4 GHz only | | Interface | USB 2.0 / USB 1.1 | | Security | WEP, WPA, WPA2, WPA3 (driver-dependent), WPS | | Operating modes | Station (client), Soft-AP, Monitor mode (limited support) | | Key distinguishing feature | Uses a vendor-specific USB protocol , not standard CDC Ethernet or RNDIS | The Realtek 8188GU is a ubiquitous chipset found