Ubuntu not booting, thrown into Busybox

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http://askubuntu.com – I get this problem even in recovery mode, even with older versions of Ubuntu that are still in the Grub menu. I ran the default repair of the Boot Disk Repair (as recommended in this question), to no avail. This Pastebin shows my configuration. How can I get my Ubuntu to boot? ...[sdb] Add. Sense: Unrecovered read error - auto real locate failed ...mount: mounting /dev/disk/bu-uuid/d818.... on /root failed: Invalid argument ... Target filesystem doesn't have requested /sbin/init BusyBox v1.18.4... built-in shell (ash) ... (initramfs) I type exit and get ... Kernel panic ... not synching (HowTos)