System -> Administration -> Printing: set up printer on mars
   vi /etc/apt/sources.list to add universe and multverse, apt-get update and apt-get upgrade
   apt-get install openssh-server
   apt-get install sun-java6-jre sun-java6-plugin sun-java6-fonts gsfonts-x11
   apt-get install flashplugin-nonfree
   apt-get install libdvdread3
   /usr/share/doc/libdvdread3/install-css.sh 
   update-alternatives --all
   crontab -e **** for apt-get update && apt-get -y upgrade
   System -> Administration -> Login Window
   - Change to Face browser
   vi /etc/X11/gdm/gdm.conf 
   - min UID changed from 1000 to 500
   - icon 128 x 128
   - add users to login screen
   apt-get install ntp-server and change the configuration file
   invoke-rc.d ntp restart
   ntpq -> lpeers
   apt-get install ssh-krb5 libpam-krb5 krb5-user
   vi /etc/krb5.conf
   ssh mars and ktadd -k earth.key host/earth.example.com
   copy key to earth and shred old copy
   mv key to /etc/
   vi /etc/pam.d/common-auth
   vi /etc/hosts and comment out 127.0.1.1
   vi /etc/hostname and add .example.com
   change UID and GID of cllee to 500 in /etc/passwd and /etc/group
   adduser poh-tin, jing-wei, zhuo-wei, change UID to 501, 502, 503 and GID respectively
   allow cdrom, audio etc for rest of users
   chown -R home directories
   vi /boot/grub/menu.lst and remove quiet splash
   reboot
   vi /etc/ssh/sshd_config
   - PermitRootLogin no
   - KerberosAuthentication yes
   - KerberosOrLocalPasswd yes
   - KerberosTicketCleanup yes
   - GSSAPIAuthentication yes
   - comment out AcceptEnv
   mv /usr/lib/mozilla-firefox/plugins/libtotem-* somewhere_else
   apt-get install mplayer mozilla-mplayer
   rsync home directory from moon or mars over
   copy the face files and chown
   apt-get install xserver-xorg-video-intel
   add "options snd-hda-intel model=3stack" to /etc/modprobe.d/alsa-base