This is the interesting part of ~/.bashrc file:

set -x
# Colores del Prompt:
export PS1="\[\e]0;\u@\h: \w\a\]${debian_chroot:+($debian_chroot)}\[\033[01;35m\]\$
title_text='\u@\h: \w'
set_title=
case $TERM in
  dtterm|rxvt|[Ek]term|*xterm) set_title='\[\e]0;'"$title_text"'\a\]';;
  screen) set_title='\[\ek'"$title_text"'\e\\\]';;
esac
PS1="$set_title$PS1"
set +x

And this is the result on screen when login in:

Last login: Sun Nov  9 16:25:05 2014 from 192.168.11.100
++ export 'PS1=\[\e]0;\u@\h: \w\a\]\[\033[01;35m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]$ '
++ PS1='\[\e]0;\u@\h: \w\a\]\[\033[01;35m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]$ '
++ title_text='\u@\h: \w'
++ set_title=
++ case $TERM in
++ set_title='\[\e]0;\u@\h: \w\a\]'
++ PS1='\[\e]0;\u@\h: \w\a\]\[\e]0;\u@\h: \w\a\]\[\033[01;35m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]$ '
++ set +x