LXDE is an extremely fast-performing and energy-saving X11 desktop environment, with a beautiful interface, multi-language support. LXDE uses less CPU and less RAM than other environments. It is especially designed for cloud computers with low hardware specifications, such as, netbooks, mobile devices.

After finishing DIY Ubuntu OS for Netbook – Installation Details, you can change to LXDE if you like. Installation is simple, just

$ sudo apt-get install lxde

Note: I installed Ubuntu base system(only a command line-based system) with Ubuntu Alternate installer CD. Some user may suggested that you can install xubuntu and remove xfce after installing LXDE. However, install from base system is recommended.

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Autostart network-manager(nm-applet) in LXDE
First, edit /etc/xdg/autostart/nm-applet.desktop, this file appears as follows;

———————————————————————
[Desktop Entry]
Name=Network Manager
Comment=Control your network connections
Icon=nm-device-wireless
Exec=nm-applet –sm-disable
Terminal=false
Type=Application
OnlyShowIn=GNOME;XFCE;
X-GNOME-Bugzilla-Bugzilla=GNOME
X-GNOME-Bugzilla-Product=NetworkManager
X-GNOME-Bugzilla-Component=general
X-GNOME-Autostart-enabled=true
X-Ubuntu-Gettext-Domain=nm-applet

———————————————————————-
Edit the file, make sure OnlyShowIn contains LXDE,
OnlyShowIn=GNOME;XFCE;LXDE;
then,
$ mkdir ~/.config/autostart
$ cp /etc/xdg/autostart/nm-applet.desktop ~/.config/autostart/
This will autostart network manager(nm-applet) after reboot.