I recently upgraded to 12.04 and was delighted to find a simple button to start a wireless hotspot in Settings > Networks.
This is all well and good, however when I try and connect my android device (Samsung Galaxy Tab rooted with Ad-hoc support) the tablet gets stuck obtaining an IP address. It times out and then tries again to reconnect ad infinitum. I don't have this problem with Windows XP/Vista/7 (tried on all three) using ad hoc or connectify. I would use my windows 7 starter netbook to create my wireless hotspot, but unfortunately it died a terrible death.
Why is the android unable to obtain an IP address? How can I fix this? Any help would be great!