The desktop installation no longer features mdadm, so this is a conscious design decision.
About your problem with lvmdiskscan, this sounds like a bug in lvm, so
please file a bug against that.
** Changed in: casper (Ubuntu)
Status: Unconfirmed => Rejected
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[regression] live cd doesn't support lvm/md (software raid) devices
https://launchpad.net/bugs/63398
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