Hopefully this has convinced you of the value of backups before
screwing with the system.
This is really going to be much easier (for you) using a liveCD - do you have one ?.
Else lets see the output from the following commands issued from the recovery terminal after plugging in a USB disk/key (for the backup)
dmesg | tail
(that last one is a vertical bar - probably on the back-slash key).