Beginner: Not able to boot Ubuntu with beaglebone

Hi All,

I am have recently brought the beaglebone. I have booted with Angstrom image supplied with the board. it works.

After power up nothing happens, not able to open serial port also. two serial port was shown, but not able to open both ports.

if i load the Angstrom SD card, then angstrom boots properly.

Can you please help me in solving this issue.

Thanks and Regards,
Ashok Kumar P