I have flashed:
as the latest image can’t be loaded by Etcher.
When I perform: apt-get update / apt-get upgrade and reboot, Ubuntu will not start up.
I get a color swatch on the screen and a blinking green light on the Pi. Nothing happens beyond that.
Even though the Ubiquity site mentions that Linux will resize the file system on first boot after flashing, I performed same using raspi-config. This time the upgrade seemed to do a LOT more stuff and took a lot longer…but it DID reboot.