gpg --export-ownertrust > file.txt
when exporting like this, the gpg data base is not exported to the new machine, therefore the keys uid is __[unknon]__
to fix this:
gpg --edit-key user@useremail.com
gpg> trus
gpg --export-ownertrust > file.txt
to fix this:
gpg --edit-key user@useremail.com
gpg> trus