To run a command as administrator (user "root"), use "sudo ＜command＞". See "man sudo_root" for details.

[동우]

http://askubuntu.com/questions/22607/remove-note-about-sudo-that-appears-when-opening-the-terminal

sudo apt-get update 그냥 업데이트 하면 해결 되네요 ㅎㅎ