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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