Making bootable Ubuntu USB
I am trying to create a live USB with Ubuntu on it. I have tried several methods to do so. Copying the iso, using specialized live USB creators, everything. Several guides that claim they all can get it to work. My problem is, I can create a live usb, but it never boots. The only way I can get it to boot, is if I bless it in the command line and select that drive while holding down option on startup. This is really annoying and I don't want to have to bless it ever time. How can I create a live, bootable USB that I don't have to bless every time I want to boot from it?
MacBook, Mac OS X (10.7.2)