The root user in Linux is the user which has administrative access to your system. Normal users do not have this access for security reasons. Kubuntu does not enable the root user. Instead, administrative access is given to individual users, who may use the "sudo" application to perform administrative tasks. The first user account you created on your system during installation will, by default, have access to sudo super user do. You can restrict and enable sudo access to users with the Users and Groups application (review the Keeping Safe documentation for more information).
當您執行一個需要 root 特權的應用程式時,sudo 會提示您輸入您的一般使用者的密碼,這樣可以確保程式不會損壞您的系統,還可提醒您,您要進行的是系統管理動作,一定要小心!
要在使用命令列時使用 sudo,只需在您希望執行的命令前加上 "sudo" 即可。 Sudo 會提示您輸入您的密碼。
Sudo 會在一段時間內記住您的密碼(預設是15分鐘),此功能使得使用者在執行多個系統管理的命令時,不用每次都要輸入密碼。
Be careful when doing administrative tasks -- you could very well damage your system!
使用 sudo 的一些其他技巧:
要使用「root」終端機,可以在指令列中輸入「sudo -i」
Kubuntu 的預設圖形化設定工具都已經使用 sudo,因此當要使用kdesu(sudo的圖形化前端),您得輸入密碼。
For more information on the sudo program and the absence of a root user in Kubuntu, read the sudo page on the Ubuntu wiki.