我剛剛將我的裝置更新到 Ubuntu 22.04，我想按照此自述文件安裝 R：https://cran.r-project.org/bin/linux/ubuntu/fullREADME.html
這工作得很好，但是，現在當我嘗試更新我的包時出現錯誤：
~$ sudo apt update
Err:1 https://cloud.r-project.org/bin/linux/ubuntu jammy-cran40/ InRelease
The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9
Get:7 http://apt.insync.io/ubuntu jammy InRelease [5.531 B]
Reading package lists... Done
W: GPG error: https://cloud.r-project.org/bin/linux/ubuntu jammy-cran40/ InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 51716619E084DAB9
E: The repository 'https://cloud.r-project.org/bin/linux/ubuntu jammy-cran40/ InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
有誰知道如何解決這個問題？我已經嘗試了自述文件中的所有儲存庫，結果相同。
答案1
在我看來，您錯過了連結的指南中的一個步驟。您需要簽署密鑰。該連結中的相關行是
wget -qO- https://cloud.r-project.org/bin/linux/ubuntu/marutter_pubkey.asc | sudo tee -a /etc/apt/trusted.gpg.d/cran_ubuntu_key.asc