Ubuntu for rock 4SE

Hi all im tryng to boot up the rock 4 SE, powered with okdo power supply 5V@3A, with ubuntu image, i downloaded the images from the following reposity


https://wiki.radxa.com/Rockpi4/downloads

in both case the rock start with green led and it stay like that for hours…

the rock is ok because i tryed a debian image from the second link and it work fine…

how i can solve it? I need of ubuntu image on rock…

thnaks !