[ubuntu] Ubuntu problems on Macbook

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http://ubuntuforums.org – So, yesterday I installed ubuntu on my Macbook, I removed all the partitions and made only one for Ubuntu, so I don't have OSX installed anymore. I used it for a while and noticed the battery doesn't last as long as on OSX, so I tried some fixes from askubuntu.com and now it's kinda ****** up and I just wanted to reinstall ubuntu, or install OSX or lubuntu. The problem is I can't access rEFIt anymore, if I create a bootable USB it just won't boot from it, and inserting the OSX install DVD does nothing, it won't boot from it. Sometimes grub bootmenu shows up but I can only boot ubuntu fro (Hardware)