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I found this thread when searching for how to put the lion installer on a flash drive using ubuntu. This thread had almost all of the information I need, and was only lacking one thing, so I'm going to finish the process for other people searching for the same thing. I hope somebody finds it helpful. Here's where you can get xar https://launchpad.net/~techzilla/+archive/misc You can get the package like this: sudo apt-add-repository ppa:techzilla/misc; sudo apt-get update; sudo apt-get install xar; Once you've done that, you can follow the instructions in the post above. I'll put them here for convenience. xar -xf OSX_Lion_10.7.dmg cd InstallMacOSX.pkg/ dmg2img InstallESD.dmg sudo dd if=InstallESD.img of=/dev/sdb bs=1M Xar should be given the correct dmg file, and the final command MUST point to your flash drive. You should double check this, and probably triple check it too, because you don't want to wipe anything important.