Anyone try this yet? I have MBP 5,2 with OSX installed. then installed Jaunty Alpha5 with ext4. Haven't gotten it to boot yet...
Have rEFIt installed and it shows OSX and Linux Penguin to boot but when I click on the penguin it sits there for a while (sometimes forever) and eventually comes back with no bootable device.
I've booted back into the ubuntu live cd and reinstalled grub per another forum post about this issue but still no luck. Wondering if grub could be having an issue with ext4 but maybe not since it should be supported with jaunty.
I've also run the rEFIt partition inspector and synced the tables up.

Here is output of partition inspector now:
Code:
*** Report for internal hard disk ***

Current GPT partition table:
 #      Start LBA      End LBA  Type
 1             40       409639  EFI System (FAT)
 2         409640     84033575  Mac OS X HFS+
 3      495339520    625141759  Basic Data
 4       84033576    100033576  Linux Swap
 5      100033577    495338264  Basic Data

Current MBR partition table:
 # A    Start LBA      End LBA  Type
 1              1       409639  ee  EFI Protective
 2         409640     84033575  af  Mac OS X HFS+
 3 *    495339520    625141759  0c  FAT32 (LBA)
 4       84033576    100033576  82  Linux swap / Solaris

MBR contents:
 Boot Code: Unknown, but bootable

Partition at LBA 40:
 Boot Code: None (Non-system disk message)
 File System: FAT32
 Listed in GPT as partition 1, type EFI System (FAT)

Partition at LBA 409640:
 Boot Code: None
 File System: HFS Extended (HFS+)
 Listed in GPT as partition 2, type Mac OS X HFS+
 Listed in MBR as partition 2, type af  Mac OS X HFS+

Partition at LBA 495339520:
 Boot Code: None (Non-system disk message)
 File System: FAT32
 Listed in GPT as partition 3, type Basic Data
 Listed in MBR as partition 3, type 0c  FAT32 (LBA), active

Partition at LBA 84033576:
 Boot Code: None
 File System: Unknown
 Listed in GPT as partition 4, type Linux Swap
 Listed in MBR as partition 4, type 82  Linux swap / Solaris

Partition at LBA 100033577:
 Boot Code: GRUB
 File System: ext3
 Listed in GPT as partition 5, type Basic Data