生成 gpg 密钥
gpg --gen-key
>>> # 会要求填写如下几个部分，冒号后面是我填写的一个具体的例子
Real Name: username
Email address: user@example.com.cn
You need a Passphrase to protect your secret key: 5aidaYUMAOQIU # 这个是用来保护密钥的密码。。。
>>>这样生成的情况下，默认是两年过期，因此接下来说明如何修改过期时间
修改 gpg 密钥过期时间
gpg --list-keys
>>>
gpg: checking the trustdb
gpg: marginals needed: 3 completes needed: 1 trust model: pgp
gpg: depth: 0 valid: 1 signed: 0 trust: 0-, 0q, 0n, 0m, 0f, 1u
/home/username/.gnupg/pubring.kbx
------------------------------------
pub rsa3072 2025-02-06 [SC]
14A8D54DAE457C5233A63C8483558764B2FCCCA1
uid [ultimate] username <user@example.com.cn>
sub rsa3072 2025-02-06 [E] [expires: 2027-02-06]
>>>
# 选中 14A8D54DAE457C5233A63C8483558764B2FCCCA1 来修改
gpg --edit-key 14A8D54DAE457C5233A63C8483558764B2FCCCA1
>>>
gpg (GnuPG) 2.2.19; Copyright (C) 2019 Free Software Foundation, Inc.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
Secret key is available.
sec rsa3072/83558764B2FCCCA1
created: 2025-02-06 expires: never usage: SC
trust: ultimate validity: ultimate
ssb rsa3072/2B236CED728F1B1F
created: 2025-02-06 expires: 2027-02-06 usage: E
[ultimate] (1). username <user@example.com.cn>
gpg> 操作 gpg> 提示符
# 可以看到子密钥 sub 才会过期，因此先通过 `key 1` 选中它
gpg> key 1
gpg> expire
# 根据提示选择 `0` 表示永不过期
gpg> save后续收尾工作
更新已经分发过的位置
比如reprepro-Self-hosted-APT-Package-Repository-Practice-Guide中：
- 服务端重新导出
gpg --output /var/www/html/apt-repository/public.key --armor --export 14A8D54DAE457C5233A63C8483558764B2FCCCA选择 y 进行 overwrite - 客户端重新添加添加密钥
wget -qO -[http://192.168.7.102/public.key](http://192.168.7.102/public.key)| sudo apt-key add -