> So I keep a stock Ubuntu image around and boot it occasionally on my dev C2 to get the newest kernel items, and I > have built up a process (not yet automated) for upgrading an SD card in my C7 laptop using the Ubuntu image along with > the C7 rootfs as on the booting SD. It's dead-simple, really, and involves replacing the kernel files on the FAT boot > partition and then the includes and modules from the Ubuntu rootfs. You might consider to run Ubuntu/F24 inside of a Docker Container (C7 supports Docker out of the box), when you need GCC5 in order to compile the C2 kernel.