I have successfully installed Ubuntu 10.04.3 Server LTS on my Apple MacPro. Everything seems to be working just fine, except one tiny problem - it boots too slowly.
But the problem in my case is that I do not have Mac OS X install disc. I wonder is there any other way to avoid this long EFI wait before GRUB?Avoid long EFI wait before GRUB
If your Macbook spends 30 seconds with "white screen" before GRUB shows, try booting from your Mac OS X install disc, select language, then click Utilities->Terminal, and enter:
bless --device /dev/disk0s1 --setBoot --legacy
Assuming that the bootloader is on sda1, otherwise /dev/disk0s2 if it's on sda2, etc.