[ubuntu] Ubuntu 12.04 can't startup in VirtualBox 4.10 "Plymouth command failed"

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http://ubuntuforums.org – BACKGROUND system mac osx 10.7.5 running running ubuntu 12.04 on virtual box 4.8 My ubuntu 12.04 was working 12 hrs ago while using it I issued apt-get install git AFAIK that was the only thing I changed in my system as I boot my mac 12 hrs later I changed a setting in virtual box in enabled USB 2.0 (EHCI) controller it said I need the virtual box extension pack so I updated my VB to from 4.8 to 4.10 then install the pack NOW now as I start my ubuntu 12.04 on VB this appears Starting the VirtualBox Guest Additions ...done. Starting VirtualBox Guest Addition service mountall: Plymouth com (Hardware)