I've got a machine with Windows 8 and just upgraded from Windows 8 to Windows 8.1. After this, I couldn't see GRUB while booting.
So, I ran boot repair (have a look at the boot repair log), but still it didn't work. Secure boot is disabled.
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See [this answer](http://askubuntu.com/a/431087/27968) – To Do Apr 13 '14 at 17:35
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possible duplicate of [Cannot Restore Grub After Windows 8.1 Upgrade](http://askubuntu.com/questions/431011/cannot-restore-grub-after-windows-8-1-upgrade) – Jens Erat Jun 05 '15 at 09:01