grub and windows8

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http://www.linuxquestions.org – I have installed Ubuntu 12.10 on a HP ENVY dv6 portable running Win8 (brand new) in a separate partition than Windows8. No problem installing but not boot menu (grub) on restart. I do not have a swap partition. A forum tells me to use EaseBCD to add an entry and make sure to use grub2. Now I get a boot menu but linux won't start because of "an error in the file or a missing file". The forum also tells me to install grub to the root partition (or a /boot partition) but the installation does not ask for the location and I do not know how to install grub in a specific place. No problem (HowTos)