Comment # 6 on bug 1172321 from Stefan Dirsch

[   142.145] Require OpenGL version 2.1 or later.
[   142.145] (EE) modeset(0): Failed to initialize glamor at ScreenInit() time.
[   142.145] (EE) 
Fatal server error:
[   142.145] (EE) AddScreen/ScreenInit failed for driver 0
[   142.145] (EE) 
[   142.145] (EE) 
Please consult the The X.Org Foundation support 
     at http://wiki.x.org
 for help. 
[   142.145] (EE) Please also check the log file at "/var/log/Xorg.0.log" for
additional information.
[   142.145] (EE) 
[   142.156] (EE) Server terminated with error (1). Closing log file.


You're still using one of these famous Netbooks it seems. The Mesa OpenGL
driver for Intel 945GM is no longer sufficient for Glamor, which is the 2D
acceleration for modeset X driver. That's an issue only on the Live system. On
a real installation the old intel driver would be used for 945GM, which doesn't
need GLAMOR for 2D acceleration.