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Seems like you forgot to call grub-install /dev/sda after replication partition table. As a simple workaround you can enter bios and tell it to boot first from /dev/sdb (second disk visible in bios). I suppose it's trying to boot from the first, /dev/sda. The thing is, first bootable partition isn't on md software raid (and it cannot be, because it's used ...


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You can use Boot-Repair to automatically fix problems with booting and GRUB. I'm not quite sure how you installed it, but the boot loader needs to be installed to /dev/sda, and NOT /dev/sda1 or /dev/sda[any number]. The automatic installation should do this properly. If you want to wipe everything and start over, you can use the GParted partition editor ...



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