After a Windows 8 update I don't get my boot menu anymore

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http://askubuntu.com – I did a software update on my 64-bit Windows 8 and after restarting my computer, I no longer get my boot menu with Ubuntu 12.10, but instead get a black screen that says: error: unknown filesystem. grub rescue> This is after running boot-repair, which gave me this link: http://paste.ubuntu.com/1369161 I really have no idea what to do. Thank you in advance for any response! (HowTos)