Recently a friend of mine bought a Dell Inspiron mini 1018. He could not get the WiFi working in Ubuntu 10.04. With a bit of ‘Google’ing, he figured out that the Realtek customer service was very prompt and they would mail you the device driver if asked for. He got it done and is happily using WiFi in his netbook!
For all the folks out there who have an issue with Realtek drivers in GNU/Linux, here is the mail ID- firstname.lastname@example.org