Online Banking using Ubuntu in Sun Virtual Box

I use Ubuntu OS in a Sun Virtual Box environment to do my online banking. Nothing else is installed in this VB other than Ubuntu and LastPass. When going to the Internet to do my online banking, the home page is my bank site and LastPass automatically logs me in. I use a separate LP account that is only for this purpose. When I check my accounts I open VB and when I am finished I close VB.

Question is this: Is this as safe method to use as a Live CD?