If rebooting from Ubuntu to Ubuntu works, and rebooting from Ubuntu to
Windows causes the boot order to be changed, then that points to a
problem with something from Windows overwriting the setting.

If rebooting from Ubuntu fails, that points to a firmware problem.

Beyond that, I don't think we can offer much help here.  Ubuntu is
already doing what it's meant to do to set the boot order, and something
external to the OS is tampering with it.

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https://bugs.launchpad.net/bugs/1314759

Title:
  Issues with dual-booting Windows 8 and Ubuntu 14.04 on a Sony Vaio
  laptop

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