It appears that mdadm is still attached to the partition. You need to
either mdadm --stop and/or --zero-superblock to make it stop using the
partition.
** Changed in: mdadm (Ubuntu)
Status: Confirmed = Invalid
** Changed in: gparted (Ubuntu)
Status: New = Invalid
--
You
** Summary changed:
- old raid superblocks can prevent formating a new partition
+ can not format new partition [old superblocks]
--
can not format new partition [old superblocks]
https://bugs.launchpad.net/bugs/342777
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