I have a bit a problem, I shrinked my windows partition. But it seems I have another partition for recovery and for my documents. I don't want to delete any of them. Is there any way to move one of them, like the document partition together with the new ubuntu partition in just one extended partition?
It might help if you become more specific in your post. For example, edit it by saying partition #1 has X and partition #2 has Y, etc.
You can have only 4 primary partitions. I had this problem recently, too. You will need to make the 4th an extended partition and then put the other partitions in that. Like you, the primary partitions was taken up by Windows and a recovery partition.
I use the gparted program to edit / move partitions under Ubuntu. If it happens to be the root partition, then I boot off Ubuntu from a CD (or USB stick) and run gparted that way. gparted can merge partitions or extend it. It is graphical based so I think it is self-explanatory. Of course, back up before you try...especially if you're planning to merge a Document partition...things can go wrong with any of the partitions, but the one you are extending / cutting, in particular.