I have a 64-bit Sabayon Linux and Mac OS X dual boot. After using gparted to resize my partitions, I can no longer boot Sabayon. I've tried chrooting and fixing grub from several live CDs, but they have all said "command not found" about either grub or chroot. Knoppix came close but then said it couldn't restore grub because it's 32 bits, rather than 64 like my Sabayon installation. Tips?
Try archlinux live discs, they surely have chroot working (repaired my systems several times with them).
Find the ISOs here
I reccomend "dual", as they have 32 and 64 bit versions of archlinux.