There are several ways to change your default applications on Ubuntu. Whether you’re changing the default application for a particular task, file type, or a system-level application like your default text editor, there’s a different place to go.
有几种方法可以更改Ubuntu上的默认应用程序。 无论您是要更改特定任务，文件类型的默认应用程序，还是要更改系统级应用程序(例如默认文本编辑器)，都可以选择其他方法。
Unlike on Windows, applications won’t take over existing file extensions during the installation process — they’ll just appear as an option after you install them.
与Windows不同，应用程序在安装过程中不会接管现有的文件扩展名-安装后，它们只会作为选项出现。
桌面应用 (Desktop Applications)
To set your default desktop applications for actions such as Web Browser, Email, or Video, open the System Settings window from the panel.
要将默认桌面应用程序设置为执行Web浏览器，电子邮件或视频之类的操作，请从面板中打开“系统设置”窗口。
