Updating to Windows 8 on dual boot with Ubuntu

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http://askubuntu.com – I have dual boot Ubuntu 12.04 and Windows Vista on separate partitions. I want to update Vista to Windows 8, buy I'm worried that I can mess up something. How should I prepare for the update? How to recover dual boot both to Ubuntu and Windows after update to Windows 8? (I assume that Windows still considers itself "One OS to rule them all" and wipes out other boot options without asking.) Are there any gotchas in general that I should be aware of? (HowTos)