How to set up a WiFi Hotspot using Kubuntu 12.04
Click on NetworkManager icon in the tray. Press 'Manage Connections' Go to Wireless Tab Press 'Add...' button but choose 'Shared'
Everything is ready, I've connected to this connection from the network manager but I dont know if that is important.
KDE also supports easy creating of a hotspot by clicking on the applet and clicking on Hotspot button.