[ubuntu] installing ubuntu on mac osx in virtual box

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http://ubuntuforums.org – i am trying to install 32 bit latest version of ubuntu on latest version of virtual box 4.2.6 on mountain lion 10.8.2 on clicking the start for the first time in virtual box it asks me the iso location of ubnutu. On providing that it shows me a black screen with message UEFI Interative shell v2.0 Revision 1.02 Mapping Table blaw blaw.... 2.0 Shell> So I was actually expecting a UI option to install ubuntu rather this shell. Please advise (Hardware)