How to install the tab completion for commands and files on ubuntu terminal

Most of the server versions for ubuntu doesn’t comes by default with this extremely useful feature, in order to use it you just need to:

sudo apt-get install bash-completion

And add this text to the ~/.bashrc file

# enable bash completion in interactive shells
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi

And just logout and login again, it should work now!