If you use lubuntu–pure lubuntu, not just the lubuntu desktop environment installed over top of an Ubuntu install–then you’ve probably found that installing the proprietary cedarview driver for GMA3600 support can leave your GUI desktop unusable (black, dead, unbootable).
Here is the trick for getting things to work.
1. *Before* installing the driver, make a backup copy of lightdm.conf. In Terminal (Ctrl+Alt+T or Applications > Accesories > LXTerminal), enter the following:
sudo cp /etc/lightdm/lightdm.conf /etc/lightdm/lightdm.conf.bak
2. Activate the driver from Applications > Preferences > Additional Drivers.
3. After a while your screen will likely go black and nothing you do will bring it back. Give it another minute or two, then switch to console mode by typing Ctrl+Alt+F1
4. Log in to console mode with your credentials and type the folling:
sudo cp /etc/lightdm/lightdm.conf.bak /etc/lightdm/lightdm.conf
5. Then reboot by typing:
sudo reboot -h now
Now when you login you’ll have a working GUI and decent support for the GMA3600.