I can't install openjdk-9-jdk

[wonder]

Please execute non english localized with LC_ALL=C so that we can understand the error message,
From what I get here its trying overwrite a file which is already in another package. Is this right ?

Yes, is right.
The error message indicate:
trying ovewrite a file wich is already in the package openjdk-9-jdk-headless:amd64 9~b114-0ubuntu1

You can't have the jdk and jdk-headless installed in parallel. So either the one or the other.

No, I can't. When I select the package jdf, synaptic indicate that, need also select jdf-headles.
If I try to install by konsole, auomatic, install the jdf-headless.

Thank you.