Boot issues with Windows 8 and Ubuntu 12.10 - BIOS Setup lost!

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http://askubuntu.com – I got a new laptop (a Vaio S series) which came with Windows 8. I wanted to install Ubuntu 12.10 alongside Windows, so I used a Ubuntu CD, booted from it and installed Ubuntu. Installation finished successfully, but then the problems began: After restarting, I encountered issues in terms of choosing which OS I wanted to use when starting up. The "Choosing OS" screen was a Windows one, and choosing Ubuntu worked, but choosing Windows didn't. After going through the Recovery Menu option, I was able to boot Windows, but after the next restart I could no longer boot Ubuntu and had to reinstall i (HowTos)