相关疑难解决方法(0)

我在/etc/apt/apt.conf.d/50unattended-upgrades. 但是我找不到他们的手册页。有人能指点我每个人的详细文件吗？谢谢。

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

在 /etc/apt/source.list 中，

deb http://us.archive.ubuntu.com/ubuntu/ precise universe
deb-src http://us.archive.ubuntu.com/ubuntu/ precise universe
deb http://us.archive.ubuntu.com/ubuntu/ precise-updates universe
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-updates universe
deb http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse
deb-src http://us.archive.ubuntu.com/ubuntu/ precise-backports main restricted universe multiverse

我想知道“精确”和“精确更新”和“精确反向移植”之间有什么区别我只知道“精确”是指 Ubuntu 12.04 版的代号。谢谢。