I see you are 'changing' from Ubuntu to Android. The fist level bootstrap loaders on the two operating systems are slightly different (and end up being incompatible). If you install the OS from a SDCard it will change everything including the first level bootstrap loaders (or at least that was the case last time I tried it). Ass far as I can tell, if you are installing with fastboot over USB, you can only update the operating system, you cannot change operating systems. The first level bootstrap loaders are only available inside the SDCard installer. Reload your system with Android from a SDCard and you should be fine.
Finally as Sujai has noted, the first time Android boots it is a real test of patience, wait 3-5 minutes.
Remember to update your MAC address after you reload the OS.
Full Disclosure: I am an employee of Qualcomm Canada. Any opinions expressed in this or any other post may not reflect the opinions of my employer.