I have a netbook which installed Lubuntu 12.04. I upgrade it to newest version 12.10. When upgrade have finish, and reboot my netbook, starting up not go to Lubuntu. just stuck black screen where askin username and password. So, I have install it again for clean style but same problem: Startup not go to graphite login, only stay balck screen.
This image is not from my netboot, but like same:
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