只是想在最新版本上将 Firefox 从 11.0 更新到 13.0 ubuntu 也这样做了：
$ sudo apt-get upgrade firefox
认为我的 Firefox 会升级。
相反，ubuntu 开始更新 整个系统似乎。现在我不能因为害怕而停止这个过程 如果我这样做可能会使系统处于不一致的状态。
我在发出正确的升级命令时哪里出错了 命令行中的单个包。好的，幸好 15 分钟 后来命令成功返回。
升级和更新有什么区别？
谢谢，
约翰·戈奇
【问题讨论】：
标签： linux ubuntu package-managers
直接取自 apt-get 手册页：
update
update is used to resynchronize the package index files from their
sources. The indexes of available packages are fetched from the
location(s) specified in /etc/apt/sources.list. For example, when
using a Debian archive, this command retrieves and scans the
Packages.gz files, so that information about new and updated
packages is available. An update should always be performed before
an upgrade or dist-upgrade. Please be aware that the overall
progress meter will be incorrect as the size of the package files
cannot be known in advance.
upgrade
upgrade is used to install the newest versions of all packages
currently installed on the system from the sources enumerated in
/etc/apt/sources.list. Packages currently installed with new
versions available are retrieved and upgraded; under no
circumstances are currently installed packages removed, or packages
not already installed retrieved and installed. New versions of
currently installed packages that cannot be upgraded without
changing the install status of another package will be left at
their current version. An update must be performed first so that
apt-get knows that new versions of packages are available.
Update 用于更新 apt-get 软件包列表，upgrade 用于安装 all 软件包的更新。要仅更新一个包，请使用 install。
sudo apt-get install firefox
【讨论】：
来自man apt-get：
升级
升级用于从枚举的源安装当前安装在系统上的所有软件包的最新版本 在 /etc/apt/sources.list。检索和升级当前安装的包含新版本的软件包
(...)
安装
install 后面跟着一个或多个安装或升级所需的包。
(...)
【讨论】：
试试这个：
apt-get update
apt-get install firefox
您还必须使用 install 命令来安装和更新软件包。
【讨论】：