ubuntu:禁用更新

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

注释掉

Unattended-Upgrade::Allowed-Origins {
//  "${distro_id}:${distro_codename}-security";
//  "${distro_id}:${distro_codename}-updates";
//  "${distro_id}:${distro_codename}-proposed";
//  "${distro_id}:${distro_codename}-backports";
};