Need help triple booting laptop

view full story

http://askubuntu.com – I installed Ubuntu 12.04 (dual boot with Windows 7 without wubi) on a disk partition of only 20 GB. No swap partition, only the root. What I want to do now is triple boot my computer by installing JoliOS on it. JoliOS is an Ubuntu based cloud disto. Little help needed with disk partitioning and GRUB bootloader. (HowTos)