I installed Ubuntu 11.10 recently by making a 5.6GB partition from the Ubiquity installer.
I wanted to upgrade to 12.04, so I opened the Update Manager and clicked on 'Update Packages' (I was following this guide)

After clicking, it said that there was too little space available.
So, I want to enlarge my Ubuntu partition so that there is appropriate space for upgrading.

I downloaded Gparted. I read another guide which said my computer won't boot if I resize the Ubuntu partition because '/boot will be misplaced and I will have to repair GRUB2 myself.'

So how do I do this easily?

Thank you in advance.