i'm so sorry i post this problem but.... i can't figure out anymore.
i had ubuntu 12.04 with virtualbox and builded desktop version.
i succeded but if i installed "guest extension" on virtualbox then running webos window was aborted.
of course if i rollback to past snapshot then it works but never with guest extension.
i need guest extension because of home button which doesn't show up in normal display resolution.
anyone knows about that?