Hi!

Using this guide:

http://ubuntuforums.org/showthread.php?t=1327758

I managaed to install Ubuntu 9.10 (64bit) on a Macbook 5.2. However, even though the partitions are synchronized Ubuntu does not show up in the rEFIt menu and the acpi has to be manually turned off at the Grub menu to successfully boot without it freezing.

Any ideas are welcome as to what could be causing this.

Jimmy