sudo apt update sudo apt-get upgrade

sudo apt update和sudo apt-get upgrade都是用于更新Ubuntu系统的命令。其中，sudo apt update命令用于更新软件包列表，它会从Ubuntu软件源获取最新的软件包信息并将其存储在本地系统中，以便后续的软件包安装和升级操作使用。而sudo apt-get upgrade命令则是用于升级已安装的软件包到最新版本。执行该命令时，系统会自动检查当前已安装的软件包是否有可用的更新版本，并将其升级到最新版本。

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sudo apt-get update sudo apt-get upgrade

sudo apt-get update用于更新软件源列表，它会访问源列表中的每个网址，并将最新的软件列表保存在本地电脑。而sudo apt-get upgrade命令用于将本地已安装的软件与软件列表中对应的软件进行对比，如果发现已安装的软件版本较低，就会提示你进行更新。通过这两个命令，你可以保持系统软件的最新状态，并获取最新的功能和修复。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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sudo apt-get updatesudo apt-get upgrade

As an AI language model, I don't have the ability to execute commands like a computer. But here's what these commands do:

- `sudo` is a command that lets you run other commands as a superuser or administrator.
- `apt-get` is a command-line tool used for package management in Ubuntu and other Debian-based Linux distributions.
- `update` updates the package list from the repositories to get the latest version information of packages.
- `upgrade` upgrades all installed packages to their latest versions.

So, when you run `sudo apt-get update`, you update the list of packages available in the repositories, and when you run `sudo apt-get upgrade`, you upgrade all installed packages to their latest versions.