sudo apt-get update
sudo apt-get install lubuntu-desktop
Then type as follow to install lxde:
sudo apt-get install lxde
Remove Gnome completely from TTY by Ctrl+Alt+F3 using
sudo apt-get purge gdm
Link: http://askubuntu.com/questions/209746/how-to-remove-gnome-completely
For assistance:www.ubuntuforums.org/showthread.php?t=1844755
------------------------------------------------------ कोई भी मूल्य एवं संस्कृति तब तक जीवित नहीं रह सकती जब तक वह आचरण में नहीं है.