I also had this issue. I searched Google after seeing that error and
came to this page.
I fear most people wouldn't think of searching Google and would go back
to Windows saying "Linux sucks" or "Ubuntu sucks" because they see an
error that has very little meaning.
** This bug is no longer a duplicate of bug 579172
mdadm is not installed as standard
** Changed in: gnome-disk-utility (Ubuntu)
Status: New => Confirmed
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[gnome-disk-utility] Can't create RAID0 because of missing package "mdadm"
https://bugs.launchpad.net/bugs/440831
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