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bbfa235
(Get the code!)
@john-center
I believe mdadm is already used by default during installation. However, when reinstalling my desktop it was not smooth at all. It seems like underlying devices got probed / mounted by something before mdadm-udeb was available in the d-i and thus i had to manualy unmount things and assemble the array from the d-i shell before continuing the installation. Apart from that ftab / bootloaders / initramfs / etc were all setup correctly.
w.r.t. changing / updating udev rules. Things are odd on xenial vs later releases, due to not using mdadm units correctly. =/ thus using offroot is currently broken on xenial, where rootfs is on the intel matrix raid, but I can double check if anything else can be improved.