About how to boot ubuntu from the SD card,you can look this link:
You need to check step by step.
I think it may be caused by the sdcard format.
You can try to format the sdcard as fat32
About how to boot ubuntu from the SD card,you can look this link:
You need to check step by step.
I think it may be caused by the sdcard format.
You can try to format the sdcard as fat32