GRUB prompt at boot after boot-repair

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http://askubuntu.com – I tried installing Ubuntu 12.04 from the live CD. The install went fine but i had the next error while booting : Grub stage 1.5 error 2. So I used boot-repair as explained here. Still not working, i got this while booting : GNU GRUB version 1.99-21ubuntu3 Minimal bash-like line editing is supported. etc.. Nothing more. Here the report from boot-repair. Could anyone help me ? (HowTos)