Fedora升级33->34

warning: /var/lib/dnf/system-upgrade/fedora-e21c25ac3662d294/packages/dnf-4.6.1-1.fc34.noarch.rpm: Header V4 RSA/SHA256 Signature, key ID 45719a39: NOKEY
Fedora 34 - x86_64                                                                   1.6 MB/s | 1.6 kB     00:00    
Importing GPG key 0x45719A39:
 Userid     : "Fedora (34) <fedora-34-primary@fedoraproject.org>"
 Fingerprint: 8C5B A699 0BDB 26E1 9F2A 1A80 1161 AE69 4571 9A39
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-fedora-34-x86_64
Is this ok [y/N]: y
Key imported successfully
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Complete!
Transaction saved to /var/lib/dnf/system-upgrade/system-upgrade-transaction.json.
Download complete! Use ‘dnf system-upgrade reboot‘ to start the upgrade.
To remove cached metadata and transaction use ‘dnf system-upgrade clean‘
The downloaded packages were saved in cache until the next successful transaction.
You can remove cached packages by executing ‘dnf clean packages‘.