So I installed ubuntu 12.04.3 LTS 64bit as the only operating system after my laptop hard drive was erased. It boots from usb happily enough and the laptop used to dual boot Windows 7 and Ubuntu 12.04 before said hard drive issues. It installs ubuntu happily enough and then gives me the option to reboot. At this point it attempts to boot from hard drive and that brings up the error Kernel panic - Not syncing: no init found. Try passing init=option to kernel. This same error occurs in the recovery mode too so the only way I can currently boot this laptop is from USB.
I have run a boot-repair and got http://paste.ubuntu.com/6239985/
I'm relatively new to ubuntu so please excuse silly questions. Would one solution be to try using the 32bit version or maybe even 13.04?