“Ключ подписи не существует” после успешной загрузки на Панели запуска

Я добавил свой пакет как ppa успешно (он говорит Successfully uploaded packages с командой dput ppa:user/my_package my_package_0.3-1_source.changes).

Однако Это говорит, что ключ подписи не существует, когда я добавляю, что мои ppa с добавляют - склонныйand after pressing[ВОЙДИТЕ]':

  # add-apt-repository ppa:my_user/my_package
  More info: https://launchpad.net/~user3514/+archive/ubuntu/screen-generator
  Press [ENTER] to continue or ctrl-c to cancel adding it

   Error: signing key fingerprint does not exist

Вывод после загрузки пакета:

# dput ppa:user/my_package source.changes
Checking signature on .changes
gpg: Signature made Tue 11 Oct 2016 12:10:31 PM CEST using RSA key ID 1BDEE64F
gpg: Good signature from "Firstname Name <mymail@gmail.com>"
Good signature on /media/git/my_package_0.3-1_source.changes.
Checking signature on .dsc
gpg: Signature made Tue 11 Oct 2016 12:10:20 PM CEST using RSA key ID 1BDEE64F
gpg: Good signature from "Firstname Name <mymail@gmail.com>"
Good signature on /media/git/my_package_0.3-1.dsc.
Uploading to ppa (via ftp to ppa.launchpad.net):
Uploading my_package_0.3-1.dsc: done.
Uploading my_package_0.3-1.tar.gz: done.    
Uploading my_package_0.3-1_source.changes: done.
Successfully uploaded packages.