SOLVED! - "no default or UI configuration directive found"

After creating an bootable USB thumbdrive of Ubuntu Linux, the resulting thumbdrive can't boot, with the error message "no default or UI configuration directive found".

Google the error message found a number of reasons described by other users, like:

• FAT32 / FAT16 issue
• corrupted ISO image file
• configuration file issues

However, in my case the reason is none of the above. If you're using Pendrivelinux to create your USB bootable drive, the chance is that the tool itself causes the error.

SOLUTION: Use unetbootin - http://unetbootin.sourceforge.net/

Give it a try!