How to delete GnuPG keys ???

When trying to delete a GnuPG key for a User (Cpanel) , I get this error.
GnuPG
Unable to delete key. You might need to
delete the secret key first (secret keys must be deleted from a ssh
session


Which is the procedure to delete the key for the user
from ssh ? I tried in several way

gpg --delete-secret-key one
gpg --list-keys one
gpg --delete-secret-key 1024D/C646A999
gpg --delete-key C646A999
gpg --delete-key C646A999 -r user

I receive always , key not found .. what to do How to delete GnuPG keys ??? ?



Thank you
Gr68

 

 

 

 

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