Ubuntu 11.04, Lenovo T420s. 
Same Error: "open /dev/null failed: ...." Then stops booting up.

Some things I found out:
1) when turning of NVIDIA Optimus in BIOS and enabling discrete graphic I got 
that error first. (else ubuntu is not able to manage the nvidia card...)
2) Intel VT-d feature (IO virtualisation) is enabled. Ubuntu stops booting 
after the "/dev/null error" appears.
3) when disabling VT-d feature ubuntu boots up (fast, but no ubuntu splash 
screen)

maybe that helps

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https://bugs.launchpad.net/bugs/575333

Title:
  On boot keeps trying to mount "UDEVD-WORK..../dev/null"

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