Having installed both rEFInd 0.6.10 (updated to 0.6.11) via its install.sh and Ubuntu 13.04 on another partition I can now choose on a MacBook Air to boot either MacOS or Linux. When running MacOS ...
I just removed my linux partition in disk utility under OSX (bad idea?) and now rather than just showing Mac OS, rEFIt shows Mac OS and 2 others. One is a "legacy OS" and the other is some reference ...
I'm copying my question from AskUbuntu (Part of stack exchange) to here, I think they'd prefer me to go here, since I seem to be getting no activity on my question: So Ubuntu 12.10 came out today ...