Need help to sort out partitions with Mac OS X + Ubuntu Dual Boot

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http://askubuntu.com – I have a MacbookPro8,1 with a 500GB HDD, running OS X 10.8.5 Mountain Lion. I used the Disk Utility app on Mac OS to create a new 50GB free space partition to install Ubuntu on. I installed rEFIt and live booted from a CD with Ubuntu 13.04 on it. While live booting I used gparted to create a SWAP area of 1GB and formatted the remaining free space as EXT4. These two were /dev/sda4 and /dev/sda5 respectively. The EXT4 was flagged as the boot loader (grub) partition. Then, I installed Ubuntu on the EXT4 through the desktop icon while live-booting from CD with no problems. After the installin (HowTos)