میتونید به طور دستی انجامش بدید. برید به این سایت
http://keyserver.ubuntu.com/ و کلید رو بزنید تا یه سری نوشته نشون بده و اون رو توی یک فاید کپی کنید و اپدیت کنید
نکته: خودم انجامش دادم فقط کافیه یه فایل بسازید به اسم مثلا key1
اینم نوشته ها رو توی فایل کپی کنید:
-----BEGIN PGP PUBLIC KEY BLOCK-----
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=bcdK
-----END PGP PUBLIC KEY BLOCK-----
وقتی این نوشته ها رو توی فایل کپی کردید با ترمینال به مسیر فایل برید و بنویسید
sudo apt-key add key1
و بعدش
sudo apt-get update