Hello everyone
I want to install and run Ubuntu MATE from a USB flash drive without a Micro SD card inserted. I can already do this with Raspbian.
I started off by writing the Ubuntu MATE image to the flash drive using Etcher, inserted the flash drive in the Pi and it does not boot.
I then edited cmdline.txt and changed root=/dev/sda2, and /etc/fstab to /dev/sda2 for/ and /dev/sda1 for /boot/. Back in the Pi, still nothing happened.
I then copied the latest bootcode.bin on the flash drive, and tried again. This time the green LED came on and the rainbow screen is displayed. After a while, the green LED flashes 7 times (kernel.img not found)., and then nothing further. 
What else must I do to get this working? 
Thank you
