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This new Linux desktop is almost a dead ringer for OS X
There's a new Linux desktop on the horizon that wants to be your next old-school MacOS desktop clone. Does it succeed?
You can also install Gershwin on Arch Linux, but I wouldn't recommend that route because it's unstable. Gershwin is clearly in alpha stage development, so if you go in expecting a fully realized desktop, you'll be disappointed. I wouldn't suggest installing Gershwin on a PC because you'll be disappointed with how little you can do with the desktop at the moment.
Or read this on ZDNet