You can only do some things, like installing applications, if you have admin privileges.
GNOME ドキュメンテーションプロジェクト
gnome-doc-list@gnome.org
松澤 二郎
jmatsuzawa@gnome.org 2011, 2012
赤星 柔充
yasumichi@vinelinux.org 2011, 2012
Kentaro KAZUHAMA
kazken3@gmail.com 2012
日本GNOMEユーザー会
http://www.gnome.gr.jp/ 2011, 2012

# Problems caused by administrative restrictions

You may experience a few problems if you don't have administrative privileges. Some tasks require admin privileges in order to work, such as:

Connecting to networks or wireless networks

Viewing the contents of a removable disk connected to the computer, or the contents of a different disk partition (e.g. a Windows partition)

Installing new applications

You can change who has admin privileges.