Download image here: https://rcn-ee.com/rootfs/
Example file to download: https://rcn-ee.com/rootfs/2018-02-09/flasher/BBB-eMMC-flasher-debian-9.3-console-armhf-2018-02-09-2gb.img.xz. We should get Debian one, over Ubuntu.
If the file name starts with
BBB-eMMC-flasher, this image will automatically run the flasher tool when the BeagleBone boots from Micro SD card, we don't need to press the button near to the Micro SD slot to activate the flasher tool.