Comment 72 for bug 468589

more comments & testing:

 - i've checked with Windows: select xpsp3 in grub2 menu & boot
   boot fine, open & use apps then close them & finally choose to restart xp: like with ubuntu, xp closed but system does not shut down, so can't reboot.

 That makes me thinking it's rather a problem with grub2 & its dependencies ( maybe os-prober) than sysvinit ( but i'm not an expert )