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apt-get update：签名验证时发生错误

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apt-get update：签名验证时发生错误 
Hit:1 http:/ubuntu.melbourneitmirror.net/archive bionic InRelease

Hit:2 http:/ubuntu.melbourneitmirror.net/archive bionic-updates InRelease

Hit:3 http:/ubuntu.melbourneitmirror.net/archive bionic-backports 
InRelease   

Hit:4 http:/ubuntu.melbourneitmirror.net/archive bionic-security InRelease

Ign:5 http:/dl.google.com/linux/chrome/deb stable InRelease   

Hit:7 http:/dl.google.com/linux/chrome/deb stable Release 

Get:6 http:/repo.ros2.org/ubuntu/main bionic InRelease [3,209 B]  

Err:6 http:/repo.ros2.org/ubuntu/main bionic InRelease    
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654

Get:9 http:/packages.ros.org/ros/ubuntu bionic InRelease [4,669 B]

Err:9 http:/packages.ros.org/ros/ubuntu bionic InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654
Fetched 7,878 B in 1s (6,188 B/s)

Reading package lists... Done

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http:/repo.ros2.org/ubuntu/main bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654

W: An error occurred during the signature verification. The repository is not updated and the previous index files will be used. GPG error: http:/packages.ros.org/ros/ubuntu bionic InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654

W: Failed to fetch http:/packages.ros.org/ros/ubuntu/dists/bionic/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654

W: Failed to fetch http:/repo.ros2.org/ubuntu/main/dists/bionic/InRelease  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY F42ED6FBAB17C654

W: Some index files failed to download. They have been ignored, or old ones used instead.

我该如何解决这个问题？请注意，我对 Linux 还很陌生。

感谢您的时间

答案1

您缺少 ros2 存储库的 GPG 签名密钥。

您可以使用以下命令添加它：

curl http://repo.ros2.org/repos.key | sudo apt-key add -

之后再次运行以下命令：

apt-get update

您已准备好出发了。

答案2

如果有人发现此页面试图解决以下问题，类似于 OP：

Get:5 https://packages.cloud.google.com/apt kubernetes-xenial InRelease [8993 B]
Err:5 https://packages.cloud.google.com/apt kubernetes-xenial InRelease
  The following signatures couldn't be verified because the public key is not available: NO_PUBKEY B53DC80D13EDEF05

原因似乎是google.comURL 不再托管密钥。根据k8s.io git repo 中的此评论该密钥可从以下 URL“暂时”获取：

因此，可以使用以下方法更新公钥：

 sudo curl -fsSLo /usr/share/keyrings/kubernetes-archive-keyring.gpg https://dl.k8s.io/apt/doc/apt-key.gpg

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