See Download Ubuntu Desktop for download links.
#MAC INSTALL LINUX ON USB INSTALL#
Lastly, this USB method actually worked(!) to install 11.10 onto my MacBook Air 3,1 (late 2010 model).
#MAC INSTALL LINUX ON USB 64 BIT#
For MacBook Air owners, it is strongly advised to obtain a MacBook Air SuperDrive (no, a regular USB CD/DVD drive does not suffice) and then use that to install through the usual CD route (using the Mac iso for a 64 bit install). In particular, if you have a MacBook Air, which doesn't have an optical drive, then the forums are filled with posts of trying the dd-to-a-partition trick and failing. This doesn't always work, even on the same hardware. The basic method is explained nicely here. One method that has worked for a number of people is to dd the bootable USB key to its own partition on your hard drive and then boot off that partition. Longer answer: (Ok, I lied above.) You can, but "it's complicated". (See this for an explanation of the difference) If you have a newer Mac (64 bit), just remember to use the Mac iso( amd64+mac), not the regular amd64 iso. If your Mac has a working optical drive, use it. Apple doesn't want you to boot an OS other than OS X off USB.