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If using VirtualBox to run Ubuntu, can you switch back and forth between OSX and Ubuntu easily?

Also, I do not want to reinstall OSX, can I partition the HD in the state it presently is in to install VirtualBox and Ubuntu?
 
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Also, I do not want to reinstall OSX, can I partition the HD in the state it presently is in to install VirtualBox and Ubuntu?
VirtualBox, like other virtual environments, is a MacOS X application. With Ubuntu installed in VirtualBox, you run Linux without ever leaving MacOS X.
 
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