sudo useradd -d /home/testuser -m testuser

sudo passwd testuser

make him sudoer my tweaking the following file


when auto filling doesnt work using tab.....

It is likely your default shell for adding users is Bourne shell, not bash.

Look at /etc/defaults/useradd, and change:




So that future user adds will default to bash.

For your current user, you should change their login shell to bash.

chsh -s /bin/bash user_name