The scripts in initramfs that should attach the root volume do not find any device as the kernel has not yet finished probing. Adding a little sleep helps, but it's not a solution.
-- initramfs-tools script doesn't wait for device initialization, preventing mdadm to assemble md arrays https://launchpad.net/bugs/83025 -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
