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"HFS+ Partition error" trying to dual boot OSX after Ubuntu 7.10 was installed

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Kalyway 10.5.1 was working correctly on my Toshiba M4. Then I decided to install the latest Ubuntu, 7.10. Now I can boot Ubuntu using GRUB but trying to boot into OSX gives me "HFS+ Partition error". I've read a number of posts about this and tried everything but nothing seems to work.


Here's what my /boot/grub/menu.lst looks like:

title OS X, 10.5

#chainloader /etc/chain0

rootnoverify (hd0,1)


#chainloader (hd0,2)/chain0

chainloader +1


title Ubuntu 7.10, kernel 2.6.22-14-generic

root (hd0,2)

kernel /boot/vmlinuz-2.6.22-14-generic root=UUID=32b39a80-159b-4e63
-8a9a-1a9e62c1cce3 ro quiet splash

initrd /boot/initrd.img-2.6.22-14-generic


Listing the partitions using fdisk on Ubuntu shows this:

Disk /dev/sda: 60.0 GB, 60011642880 bytes

255 heads, 63 sectors/track, 7296 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk identifier: 0x00000000


Device Boot Start End Blocks Id System

/dev/sda1 1 26 204819+ ee EFI GPT

/dev/sda2 * 26 2722 21658340 af Unknown

/dev/sda3 2722 4911 17578125+ 83 Linux

/dev/sda4 5392 7280 15166240 af Unknown

Also, I'm using GUID partitioning.


So given the above, what do I need to do to get OSX to dual boot with Ubuntu?



Please help.



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