Sudo is a tool default with Ubuntu, which allows users to execute
administrative tasks (e.g. installation, remove etc). sudo is not
available with Debian default. Ubuntu user may feel difficult while work
with Debian without sudo. User has to install sudo tool first.
Open terminal and apply following commands,
su
apt-get install sudo
adduser username sudo
Logout from desktop.
Login again.
Courtesy
http://linuxhalwa.blogspot.com/search/label/Add%20user
