The Realtek 8188GU driver represents a specific era of computing. It is the last bastion of the single-band, single-antenna wireless era. It lacks the bells and whistles of modern hardware, and finding the "perfect" official driver can be a scavenger hunt.
Would you like a direct link to the known-working Linux driver or a step-by-step installation guide for a specific OS? realtek 8188gu wireless lan 802.11n usb nic driver