Partition SSD in Yosemite for Dual-Booting Ubuntu

I've just bought a new Macbook Air (running Yosemite) and I am trying to create a partition from my Macintosh HD SSD for dual-booting Ubuntu. However when I try to create a partition in Disk Utilities, I keep getting the error "This Core Storage operation is not allowed on a sparse logical volume group." I have tried restarting the system in Recovery Mode and verifying and repairing the disk, but it did not work. What can I do to partition? (I would prefer to not format the SSD.)