So, I have a 1 TB SSD and 4 TB HDD that I want to use for windows and a 500 GB SSD and a 1 TB HDD that I want to use for ubuntu. I already have windows installed on the 1 TB SSD and have files on the 4 TB HDD, I just physically installed the 500 GB and 1TB drives and then formatted them in windows. I have a bootable ubuntu install USB but I am having difficulties during the install telling the computer which drives are for what, it is saying that the drive doesn't have a root file system, how do I set that up?