I have thought about putting Ubuntu on my Macbook in boot camp, but if i somehow regret after i installed it, can i get my HDD space back i putted aisde?
I have installed Ubuntu on a VM via Parallels and it works - despite the lack of Parallels Tools support in Linux. I would imagine you might encounter some driver issues in Bootcamp.
So it will be better to install it in parellels or waht, and if i do, can i get my hdd space back?
I would - unless you need 3D support in Ubuntu.
Either way, yes, you can get your space back.