I need a WiFi hotspot application like Connectify! I have a Samsung Galaxy S II and it doesn't find ad-hoc access point
What can I do?
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You need a wifi chip that supports host mode for that. Sadly most of them don't. If you can verify that yours supports host mode take a look into
As alternative there are some apps in the play store that claim to be able to connect to ad-hoc networks. Those need at last android 4 and root access. A lot of people are having problems with this but it may be worth a try if you haven't tried already.
Note that such network will have access to the Internet only if your Ubuntu is connected to it via other means (e.g. wire), for a single wi-fi antenna cannot work as hotspot while being used to connect to some other network.