Download the latest version of Ap-hotspot from Https://launchpad.net/~nilarimogard/+archive/ubuntu/webupd8/+packages and install it, I'm using Ap-hotspot- 0.3.1-1~webupd8~0. Execute sudo ap-hotspot configure under Terminal
This step will check Ubuntu network and WiFi interface, OK will prompt you to configure the hotspot, enter the SSID and password and so on.
Then execute sudo ap-hotspot start.
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But the reality is always cruel, under the Ubuntu14.04 this still cannot succeed. Since the new version of HOSTAPD has bugs, we need to downgrade to a usable old one. Reference Link: http://askubuntu.com/questions/464178/ap-hotspot-not-creating-in-kubuntu-14-04
Follow this link, after installing the old version of HOSTAPD, using Ap-hotspot will prompt not installed, need to reinstall and configure. Finally, you can successfully establish an AP hotspot.