root@Ubuntu:/# compiz --replace
Checking for Xgl: not present. 
Detected PCI ID for VGA: 00:02.0 0300: 8086:2572 (rev 02) (prog-if 00 [VGA])
Checking for texture_from_pixmap: not present. 
Trying again with indirect rendering:
Checking for texture_from_pixmap: present. 
Checking for non power of two support: present. 
Checking for Composite extension: present. 
Comparing resolution (1024x768) to maximum 3D texture size (2048): Passed.
Checking for nVidia: not present. 
Checking for FBConfig: present. 
Checking for Xgl: not present. 
Starting emerald
/usr/bin/compiz.real (core) - Warn: SmcOpenConnection failed: Authentication Rejected, reason : None of the authentication protocols specified are supported and host-based authentication failed
/usr/bin/compiz.real (dbus) - Error: dbus_bus_get error: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
/usr/bin/compiz.real (core) - Error: Couldn't activate plugin 'dbus'