I found the work around this bug on Lenovo S205. 
Enter the BIOS SETUP (F2 on start) and choose "Boot" entry. You can see 
"ubuntu" item on the top of boot sequence list and a name of your HDD below. It 
is need to raise this item to the top instead of "ubuntu". Press F10 to save. 
After that kernel can boot with "noefi" option and with that, halt/reboot/sleep 
working properly.
Sorry for my English...

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https://bugs.launchpad.net/bugs/721576

Title:
  [natty] kernel panic on reboot with (U)EFI

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