[Lazarus] how to debug from virtualbox

[FreeMan]

Hello,
I have kubuntu 13.10 x64, fpc & lazarus last svn. My application work 
without problem on linux but, crosscompiled to win and test in win8, one 
form has a bug, application freezing without error, I need to debug it. 
I dont wanna install all fpc lazarus and other component there too.
win8 on virtualbox, How to debug ? IDE and fpc in kubuntu, application 
on w8, w8 in virtualbox
Thank you