Please read the download page, it has something mentioning Linux on it.
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I feel your pain.
Yes, there is scratch for linux here.
However, I strongly recommend you to run Windows on your VM and Scratch on top of that, because it yields much stronger,better results. If you don't have a VM, use VirtualBox, because it can allow Windows applications to appear on a Linux desktop.
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If you look at the download page, go to the bottom and look for something saying, "Have a Linux computer?" or something like that and go to the link it sends you to. ( http://info.scratch.mit.edu/Linux_installer )
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