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sudo apt install unattended-upgrades
sudo vim /etc/apt/apt.conf.d/50unattended-upgrades

去掉 update 一行前的注释，并修改自动清除未用包的设置。

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"${distro_id}:${distro_codename}-updates";
...
Unattended-Upgrade::Remove-Unused-Kernel-Packages "true";
Unattended-Upgrade::Remove-Unused-Dependencies "true";

image-20191117001230583

然后修改重启配置：

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sudo vim /etc/apt/apt.conf.d/20auto-upgrades
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APT::Periodic::Update-Package-Lists "1";
APT::Periodic::Unattended-Upgrade "1";

最后测试运行，确认生效：

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sudo unattended-upgrades –dry-run –debug