This is an FAQ for people ship a commercial product that needs to comply with GPL. Here are the links of each software components used in ubuntu core image.
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Download deb source packages in the Core snap
https://gist.github.com/chihchun/59358b21778e53e8af99cdfbd4d535ac -
Source code of Core Snap
snapcore/core: This repository contains the source code of the core snap - https://github.com/snapcore/core
snapcore/core16: The core16 snap - https://github.com/snapcore/core16 -
Gadget Snap
The gadget snap for Personal Computers using 64bit Intel or AMD processors - https://github.com/snapcore/pc-amd64-gadget -
Kernel snap
kernel source https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux-snap/+git/xenial/log/?h=pc
snapcraft.yaml of kernel snap https://launchpad.net/~ubuntu-kernel/+snap/pc-kernel