1.错误信息
W: GPG error: http://repo.mysql.com/apt/ubuntu xenial InRelease: The following signatures were invalid: KEYEXPIRED 1487236823 KEYEXPIRED 1487236823 KEYEXPIRED 1487236823
解决方法如下
1）先查看所有key，执行命令：apt-key list
/etc/apt/trusted.gpg
--------------------
pub 1024D/437D05B5 2004-09-12
uid Ubuntu Archive Automatic Signing Key <[email protected]>
sub 2048g/79164387 2004-09-12
pub 4096R/C0B21F32 2012-05-11
uid Ubuntu Archive Automatic Signing Key (2012) <[email protected]>
pub 4096R/EFE21092 2012-05-11
uid Ubuntu CD Image Automatic Signing Key (2012) <[email protected]>
pub 1024D/FBB75451 2004-12-30
uid Ubuntu CD Image Automatic Signing Key <[email protected]>
pub 1024D/5072E1F5 2003-02-03 [expired: 2017-02-16]
uid MySQL Release Engineering <[email protected]>
2）删除mysql 的repository GPG key，删除命令如下：
sudo apt-key del 5072E1F5
3）删除完了之后，检查还有没有那个mysql的key ， 如果没有执行命令
apt-key adv --keyserver pgp.mit.edu --recv-keys A4A9406876FCBD3C456770C88C718D3B5072E1F5
输出如下信息
Executing: /tmp/tmp.NNzzzLW5hE/gpg.1.sh --keyserver
pgp.mit.edu
--recv-keys
A4A9406876FCBD3C456770C88C718D3B5072E1F5
gpg: requesting key 5072E1F5 from hkp server pgp.mit.edu
gpg: key 5072E1F5: public key "MySQL Release Engineering <[email protected]>" imported
gpg: Total number processed: 1
gpg: imported: 1
gpg: no writable keyring found: eof
gpg: error reading `[stdin]': general error
gpg: import from `[stdin]' failed: general error
gpg: Total number processed: 0
2.错误信息
W: GPG error: http://repo.mysql.com/apt/ubuntu xenial InRelease: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 8C718D3B5072E1F5
解决方法如下
sudo apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 8C718D3B5072E1F5
3.错误信息
E: Failed to fetch http://extras.ubuntu.com/ubuntu/dists/xenial/main/binary-amd64/Packages 404 Not Found [IP: 91.189.88.91 80]
解决方法如下
1）先备份 /etc/apt/sources.list 文件
sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak
2）将 /etc/apt/sources.list 的文件内容替换为如下
deb http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
##测试版源
deb http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
# 源码
deb-src http://mirrors.aliyun.com/ubuntu/ xenial main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-security main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-updates main restricted universe multiverse
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-backports main restricted universe multiverse
##测试版源
deb-src http://mirrors.aliyun.com/ubuntu/ xenial-proposed main restricted universe multiverse
# Canonical 合作伙伴和附加
deb http://archive.canonical.com/ubuntu/ xenial partner
#deb http://extras.ubuntu.com/ubuntu/ xenial main
即将所有的源替换为阿里云，并且注释掉源#deb http://extras.ubuntu.com/ubuntu/ xenial main