Installing 11.04 on MacBook Pro, Can't See Partition

[jasonmac53]

I've been trying to install 11.04 on my MacBook Pro5,2, (already have Mac OS X Snow Leopard and Windows 7 installed) but every time I get to screen where it asks me to install, the installation GUI doesn't see my partitions. The strange thing is that if I run sudo fdisk -lu /dev/sda I get:


Disk /dev/sda: 160.0 GB, 160041885696
255 heads, 63 sectors/track, 19457 cylinders, total 312581808 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x32104075

Device Boot Start End Blocks Id System
/dev/sda1 1 409639 204819+ ee GPT
/dev/sda2 * 409640 166425271 83007816 af HFS / HFS+
/dev/sda3 166688768 254389274 43850253+ 7 HPFS/NTFS
/dev/sda4 254390272 312580095 29094912 83 Linux


Seems like everything is fine, no sectors are overlapping, and fdisk definitely recognizes the partition. But when I run the graphical install, I get a menu that says:


Device Type Mount point Format? Size Used
/dev/sda
free space 0 MB
/dev/sda1 efi 209 MB 209 MB
/dev/sda2 hfs+ 85000 MB 76954 MB
/dev/sdb
...


There's no option to choose /dev/sda4!! (or even /dev/sda3, my Windows partition)

If it also helps to know, /dev/sda is an Intel x25-M SSD, and I also have another internal HDD (using an OptiBay), so I'm running the install from an external DVD drive.