Ubuntu 16.04 installer cant see SSD drive previously used as RAID
If drive was previously part of a RAID set it may have RAID meta-data on it. Change example from sdx to whatever drive is sda, sdb etc.
sudo dmraid -E -r /dev/sdx
Just do dd if=/dev/zero of=YOUR_SSD_DRIVE bs=1024k count=10 then try again.
This will erase all metadata that may have been on the drive.