@hummlbach said in Exploring Ubuntu Touch - Dissecting this Linux Black Box - Part 1:
Though I'm not quite sure about this ubuntu.img in data being mounted as root partition. Is it really like that? Can't imagine it (or did I misunderstood you).
Yes. That provides the rootfs for UT. This is part of the reason why bootloader cannot be locked again after flashing, as doing so will erase /data partition, and thus delete the UT rootfs image.