一、问题
在使用 apt-get update 在 Ubuntu 环境更新包资源时，出现了以下报错：
Ign http://repo.mysql.com trusty/mysql-tools Translation-en Fetched 3,164 B in 1min 42s (30 B/s) Reading package lists... Done W: GPG error: http://repo.mysql.com trusty InRelease: The following signatures were invalid: KEYEXPIRED 1487236823 KEYEXPIRED 1487236823 KEYEXPIRED 1487236823
从报错的信息看是因为签名参数过期了，所以，这里需要删除后再更新。
二、解决
先查看执行命令：apt-key list
root@iZ9:/var/www/html/gryphon# apt-key list /etc/apt/trusted.gpg -------------------- pub 1024D/437D05B5 2004-09-12 uid Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com> sub 2048g/79164387 2004-09-12 pub 1024D/FBB75451 2004-12-30 uid Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com> pub 4096R/C0B21F32 2012-05-11 uid Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com> pub 4096R/EFE21092 2012-05-11 uid Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com> pub 4096R/0EBFCD88 2017-02-22 uid Docker Release (CE deb) <docker@docker.com> sub 4096R/F273FCD8 2017-02-22 pub 1024D/5072E1F5 2003-02-03 [expired: 2017-02-16] uid MySQL Release Engineering <mysql-build@oss.oracle.com> /etc/apt/trusted.gpg.d/chris-lea-node_js.gpg -------------------------------------------- pub 1024R/C7917B12 2010-05-17 uid Launchpad chrislea /etc/apt/trusted.gpg.d/ondrej-php.gpg ------------------------------------- pub 1024R/E5267A6C 2009-01-26 uid Launchpad PPA for Ondřej Surý
删除mysql 的repository GPG key，删除命令如下：
sudo apt-key del 5072E1F5
删除完了之后，检查还有没有那个mysql的key
没有了，执行命令
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 8C718D3B5072E1F5
输出：
root@iZ9:/var/www/html/gryphon# sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 8C718D3B5072E1F5 Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --homedir /tmp/tmp.RkicIHyEqq --no-auto-check-trustdb --trust-model always --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyring /etc/apt/trusted.gpg.d/chris-lea-node_js.gpg --keyring /etc/apt/trusted.gpg.d/ondrej-php.gpg --keyserver keyserver.ubuntu.com --recv 8C718D3B5072E1F5 gpg: requesting key 5072E1F5 from hkp server keyserver.ubuntu.com gpg: key 5072E1F5: public key "MySQL Release Engineering <mysql-build@oss.oracle.com>" imported gpg: Total number processed: 1 gpg: imported: 1
我们再次查看：apt-key list
root@iZ94j7ehy5oZ:/var/www/html/gryphon# apt-key list /etc/apt/trusted.gpg -------------------- pub 1024D/437D05B5 2004-09-12 uid Ubuntu Archive Automatic Signing Key <ftpmaster@ubuntu.com> sub 2048g/79164387 2004-09-12 pub 1024D/FBB75451 2004-12-30 uid Ubuntu CD Image Automatic Signing Key <cdimage@ubuntu.com> pub 4096R/C0B21F32 2012-05-11 uid Ubuntu Archive Automatic Signing Key (2012) <ftpmaster@ubuntu.com> pub 4096R/EFE21092 2012-05-11 uid Ubuntu CD Image Automatic Signing Key (2012) <cdimage@ubuntu.com> pub 4096R/0EBFCD88 2017-02-22 uid Docker Release (CE deb) <docker@docker.com> sub 4096R/F273FCD8 2017-02-22 pub 1024D/5072E1F5 2003-02-03 [expires: 2022-02-16] uid MySQL Release Engineering <mysql-build@oss.oracle.com> /etc/apt/trusted.gpg.d/chris-lea-node_js.gpg -------------------------------------------- pub 1024R/C7917B12 2010-05-17 uid Launchpad chrislea /etc/apt/trusted.gpg.d/ondrej-php.gpg ------------------------------------- pub 1024R/E5267A6C 2009-01-26 uid Launchpad PPA for Ondřej Surý
我们可以看到，mysql 的过期时间已经变为 2022-02-06 了
pub 1024D/5072E1F5 2003-02-03 [expires: 2022-02-16]
uid MySQL Release Engineering <mysql-build@oss.oracle.com>
然后我们再更新包：