Lubuntu hotspot starts up and then disconnects

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http://askubuntu.com – I'm need to use my laptop (with lubuntu 12.04) as a WiFi hotspot. I created the wifi hotspot via "Create new wireless network" from the network connections menu. The hotspot comes up and then disconnects. I can see this on my Android phone and tablet. I installed WiFi analyser and shows the new network coming up. Then suddenly after 2-3 minutes the new WiFi network dissapears from the air. Any ideas, suggestions? (HowTos)