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我尝试在Debian 10（buster）机器上更新git版本，遇到了gpg key的问题。

> sudo add-apt-repository ppa:git-core/ppa
 The most current stable version of Git for Ubuntu.

For release candidates, go to https://launchpad.net/~git-core/+archive/candidate .
 More info: https://launchpad.net/~git-core/+archive/ubuntu/ppa
Press [ENTER] to continue or ctrl-c to cancel adding it

gpg: keybox '/tmp/tmpfqaimru3/pubring.gpg' created
gpg: /tmp/tmpfqaimru3/trustdb.gpg: trustdb created
gpg: key A1715D88E1DF1F24: public key "Launchpad PPA for Ubuntu Git Maintainers" imported
gpg: Total number processed: 1
gpg:               imported: 1
gpg: no valid OpenPGP data found.

我也尝试手动添加密钥，但在成功添加密钥后仍然以同样的错误结束。

> sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys A1715D88E1DF1F24
Executing: /tmp/apt-key-gpghome.pwYjc1J0zy/gpg.1.sh --keyserver keyserver.ubuntu.com --recv-keys A1715D88E1DF1F24
gpg: key A1715D88E1DF1F24: public key "Launchpad PPA for Ubuntu Git Maintainers" imported
gpg: Total number processed: 1
gpg:               imported: 1

并且：

> gpg --export  A1715D88E1DF1F24 | sudo apt-key add  -
gpg: WARNING: nothing exported
gpg: no valid OpenPGP data found.

不知道我做错了什么。我也做了几次更新。

> sudo apt-get update