What I've done:
1. Created 1 GB partition (ext4)
2. Installed to USB using unetbootin
3. Added a second partition as described in your guide
Won't boot. All I get is "Missing operating system" when I try to boot off the USB drive. Checked fdisk, partition is flagged bootable. Mounted the partition, files are there. I'm perplexed. Thoughts?
Thanks.
You've got the filesystem types mixed up, the 1G partition should be fat32. the second can be ext3 or ext4.