如题，服务器报错：
查看日志：
发现问题：
Starting Daily apt upgrade and clean activities...
这个 apt upgrade 不是普通的update, upgrade 会直接引起系统的不稳定， 相关进程或者服务重启。
解决：
sudo apt-get remove unattended-upgrades （选择y)
sudo su , 然后复制粘贴：
systemctl kill --kill-who=all apt-daily.service
systemctl stop apt-daily.timer
systemctl disable apt-daily.timer
systemctl stop apt-daily.service
systemctl disable apt-daily.service
systemctl mask apt-daily.service
systemctl daemon-reload
验证：
systemctl status apt-daily.timer
注意结果中的：
Active: inactive (dead)
参考文献：
http://www.siwei.me/blog/posts/ubuntu-mysql
https://www.gongzi.org/disable-daily.html
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