it worked!!
Thanks so much, using these methods I was able to install Ubuntu 12.04 on my Macbook Air 1,1!! I had to do a couple tweaks, so below are the instructions from the first post modified with the additional stuff I did:
+Download Ubuntu.iso from ubuntu.com
+Download UNetbootin from sourceforge and use it to install the ubunto.iso file to a usb stick
+Use the Mac Disk Utility to create 2 new partitions
-2gb FAT for Ubuntu live cd files
-20gb FAT or more to be used later
+In Mac Terminal, type "diskutil list" to see what the names of your
partitions are. For me it was /dev/disk1s1 for my USB stick and
/dev/disk0s4 for my 2GB FAT partition.
+Move installation files from USB stick to 2GB partition:
-sudo dd if=/dev/disk1s1 of=/dev/disk0s4
-Note: the names of your disks could differ
+Install rEFIT
-on restart rEFIT should load
-go to "set up partitions" (or something similar to that)
-answer yes to sync and activate FAT partition
- restart computer
+launch Ubuntu (from partition)
- choose the option "Try Ubuntu without installing"
+Now you can play with your little Ubuntu system and see if you like it. If you do, it's time to install. But first, you have to open the Ubuntu terminal using ctrl-alt-t and then type the following commands:
$ sudo cp -r /cdrom /cdrom2
$ sudo umount -lfr /cdrom
$ sudo rmdir /cdrom
$ sudo mv /cdrom2 /cdrom
+Now double-click the Ubuntu installer. Choose "another setup" for your partitions.
-at the partitioning list:
-delete the 20GB+ FAT partition to create free space
-with the newly added 20GB+ free space click "ADD"
-add a 1GB EXT2 partition with mount point /boot
-add a 2GB partition of type swap
-add a 1GB partition of type BIOS
-add a 16+GB partion of type EXT4 with mount point /
+Click done hopefully it will install!!
(some of this extra info came from
http://cweiske.de/tagebuch/ubuntu-on-macbook-air.htm)