dual boot - Install ubuntu 12.04 on macbook air 6.2: refit resync partitions

I'm trying to set up a MacBook Air 6,2 to dual boot OSX and Ubuntu 12.04.

I've been following these instructions:

https://help.ubuntu.com/community/MactelSupportTeam/AppleIntelInstallation

I'm using refit instead of refind because I saw some reports that refind wasn't working properly with MacBook Airs (and that refit worked fine).

I've gotten to the point of needing to resync the partition tables in refit. When I run the partition tool I see this:

http://i44.tinypic.com/2crq4vo.jpg

Is this what it's supposed to look like?

I'm concerned that in my current GPT table the partition I formatted as EXT4 and set to mount at / is showing up as "basic data" and that in the "Proposed new MBR partition table" there is no linux. If this is not as it should be what might be the problem and how might I fix it?

Thanks!