Using 12.04.3 to install and boot up the system, it works well.
It will use radeon driver and runs unity 3d without any problems.

So, I think the problem had been fixed by 12.04.3

** Changed in: linux (Ubuntu)
       Status: In Progress => Fix Released

** Changed in: linux (Ubuntu Precise)
       Status: Confirmed => Fix Released

** Changed in: linux (Ubuntu Quantal)
       Status: Confirmed => Fix Released

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https://bugs.launchpad.net/bugs/1125610

Title:
  [Lenovo b475e]: Precise 12.04.2 install fails

Status in “linux” package in Ubuntu:
  Fix Released
Status in “linux” source package in Precise:
  Fix Released
Status in “linux” source package in Quantal:
  Fix Released

Bug description:
  Attempting an install of 12.04.2 precise results in a few major
  blocking issues.

  B475e 1: 
      Mainboard LB475B UMA MB SIT 11312-SB 1.0G DIP#1
      UEFI BIOS version: HPET18WW (1.03)
      UEFI BIOS Date 2012-05-29

      Problem encountered:
          Systems hangs while at Ubuntu Splash screen. Will not accept any 
keyboard activity
      Steps to reproduce:
         1.) Download and Install 12.04.2 to key, cd, or other boot media.
         2.) Choose "Install Ubuntu" Option

  B475e 2: 
      Mainboard LB475B UMA MB SIT 11312-SB 1.7G DIP#5
      UEFI BIOS version: HPET09WW (0.09)
      UEFI BIOS Date 2012-03-15

      Problem encountered:
          Systems hangs while at grub loader after installation:
          error: no suitable mode found
          error: no video mode available

          Also, to control boot menu options an external usb keyboard must be 
used. Cannot use onboard keyboard.
      Steps to reproduce:
         1.) Download and Install 12.04.2 to key, cd, or other boot media.
         2.) Choose "Install Ubuntu" Option
         3.) Go through installation process
         4.) Remove media 
         5.) Reboot

  
  These machines do not present a problem installing 12.04.1
         6.) Wait for machine to attempt to boot from HD.

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