You can probably get to the restore partition for a factory reset, of the original OS...
As far as I know you need to start over with a fresh install from a liveusb...
Unless you used systemback and made a restore point from then that you could restore to..
Not sure of your set up... if you dual boot, but if you do.. Wipe windows, delete or restore to default.. Reinstall LL
Most importantly removing your data/formating the drive..
