Failed to install Ubuntu 12.10 on Oracle VM VirtualBox

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http://askubuntu.com – Virtual Computer setup: 512 MB RAM Laptop spec: i3 2.1Ghz 2GB DDR3 RAM Nvidia GT525M I am install ubuntu successfully just now, but the VM become no responding once the installation done. Should I restart inside the OS of VM or restart by using VM controller? (HowTos)