I mistakenly ran dd on sda which is the current hard-drive Ubuntu installed on.
I aborted dd (using ctrl-x) and when rebooted the machine it no longer boots with Ubuntu :(
I have nothing important on the machine, so I don't care to lose everything on it.
Trying to install Ubuntu from Disk-On-Key didn't work (error: umount: /dev device busy)
Tried to use repair-boot from Disk-On-Key and still didn't work (says everything finished successfully, but after rebooting I get the same errors)
My question is: do you have any idea how I can have Ubuntu installed on the machine (again, don't care to lose everything on it)?