I also installed Kubuntu 13.10 on a machine where previous installs would not boot. I chrooted into the new install from the live system, enabled -proposed, updated and ran grub-update. Kubuntu now successfully boots. There is no Windows entry in the boot menu, Windows is the other OS on this machine, but I'm skeptical of this machine anyway (a sony Vaio) as the firmware had some known bugs last time I looked at it.
I also installed Kubuntu 13.10 on a machine where previous installs would not boot. I chrooted into the new install from the live system, enabled -proposed, updated and ran grub-update. Kubuntu now successfully boots. There is no Windows entry in the boot menu, Windows is the other OS on this machine, but I'm skeptical of this machine anyway (a sony Vaio) as the firmware had some known bugs last time I looked at it.