I accidentally recorded ubuntu ontop of my external hard drive. Is there someone along

1-2-1 street who can recover my data? There used to be a shop next to Minzu U. but I don't know if its still there.

Yeah, I'd also need someone to professionally recover data from a dropped external HD with faulty hardware.
Kongming, if your external HD is Seagate, try their sftwr Seatools.

download the Ricuva software from the same guys as CCleaner and you can see what you can recover.