Ubuntu 服务器消息显示软件包可以更新,但 apt-get 并未更新任何

Ubuntu 服务器消息显示软件包可以更新,但 apt-get 并未更新任何

可能重复:
amazon-ec2 ubuntu 10.04 服务器中的更新

当我登录 Ubuntu 10.04.2 LTS 服务器时,我看到以下消息:

42 packages can be updated.
18 updates are security updates.

但是当我尝试更新它时,没有任何内容像预期的那样得到升级:

$ sudo apt-get update
....snip....
Reading package lists... Done
$ sudo apt-get upgrade
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following packages have been kept back:
  linux-generic-pae linux-headers-generic-pae linux-image-generic-pae
0 upgraded, 0 newly installed, 0 to remove and 3 not upgraded.

有什么想法可以解释为什么没有更新任何内容,或者为什么计数 3(来自 apt-get)与 42 不同?如果不是 apt,哪个软件会显示 42?

(其他详细信息:这是服务器版本,没有 GUI;我没有接触过 apt 配置文件;当我安装软件时,我拒绝允许自动更新)

答案1

为了安装软件包被阻止你必须运行:

sudo apt-get update && sudo apt-get dist-upgrade

尝试运行,但sudo apt-get update && sudo apt-get upgrade无法安装软件包被阻止因为apt-get upgrade默认情况下不会尝试安装新的软件包(例如新的内核版本);从手册页中:在任何情况下都不会删除当前安装的软件包,也不会检索和安装尚未安装的软件包。

但是apt-get dist-upgrade允许您在需要时安装新的软件包(即新的内核版本);从手册页:

  dist-upgrade
       dist-upgrade in addition to performing the function of upgrade, also intelligently handles changing dependencies with new
       versions of packages; apt-get has a "smart" conflict resolution system, and it will attempt to upgrade the most important
       packages at the expense of less important ones if necessary. So, dist-upgrade command may remove some packages. The
       /etc/apt/sources.list file contains a list of locations from which to retrieve desired package files. See also
       apt_preferences(5) for a mechanism for overriding the general settings for individual packages.

答案2

此消息来自 MOTD(每日消息)系统。有关如何修复此消息与包管理器之间的不一致的详细信息,最近已在这个答案

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