Fresh Install and partitioning Problem and Doubts

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http://askubuntu.com – I must say i'm new to ubuntu and already burned my head today looking for information so I'm asking this through here. I will appreciate your answers. In Fact I have 2 questions: I Have a fresh install of ubuntu and in Gparted I have the information of having: /dev/sda1 ext2 /boot 243mb 49.22mb used /dev/sda2 extended 595.93 GiB /dev/sda5 crypt-luks 595.93 GiB This last line has a "!" mark that says: "Linux Unified Key Setup Encryption is not yet supported". sda5 is accopolated to sda2 as if we are talking about the same partition, in fact my hard drive has 600gb. So (HowTos)