1. Install packages for Debian

a. Install compiler, linker and make utilities such as gcc, set up the C
language programming environment: 

$ su root -c 'aptitude search build-essential' 
Password: 
i build-essential - informational list of build-essential pack 

$ su root -c 'aptitude install build-essential' 

b. Install manpages for programming: 

$ su root -c 'aptitude install manpages-dev' 

$ su root -c 'aptitude search openssh-server' 

2. Start Debian-40r0 in command line

a. Enable run level 3 in file: /etc/inittab as the following: 

#id:2:initdefault: 
id:3:initdefault: 

b. And disable S21gdm as the following: 

$ su root -c 'mv /etc/rc3.d/S21gdm /etc/rc3.d/K00S21gdm' 

c. Start the X window on local terminal by: 

$ startx