System-bootfinder not found

Hello,
unable to boot on dual mode on my macbook 2008 , 10.6.8 snow leopard, dual mode, ubuntu 16.04 LTS
There is only the message: "System-bootfinder not found .Creating boot entry 0009.
Load image failed."

How to recover the EFI of the Apple HFS partition?

Thanks in advance

Aldo

Attached Images

• Bildschirmfoto vom 2020-07-24 18-25-52.png (84.0 KB)