How can I fix the screen blurred while installing Ubuntu 12.10 Beta1

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http://askubuntu.com – I installed Ubuntu 12.10 Beta1 yesterday, but the screen blurred always shows after selecting Install Ubuntu on a Hard Disk option and before waiting for the installation interface. . The method of installation is by U-disk, the name of Ubuntu 12.10 is quantal-desktop-i386.iso (the download link is from Universal-USB-Installer), and Universal-USB-Installer was used to write the Ubuntu 12.10 into U-disk. PS. Ubuntu 12.04 could be installed successful on my computer! (HowTos)