I found out I can do that with
gparted, but I am just wondering, in my case, how to act and what steps to take, because the partitions situation is messy:
sda2 are the system reserve for Windows and the
C drive, respectively. The
sda3 is the
D drive, which I use for personal data and I use it from both Win and Ubuntu. And then follow the Linux drives.
The 30 GB of unallocated space, between
D, I freed from the
C drive and want to extend
sda6 with it (actually I want to do it with 70 GB in total, but these 30 GB were just for testing).
A friend told me that I can't allocate the free space to
sda3 stands in between. I am really unacknowledged in this situation, so I would like to ask for some help and more precisely - tips for what to do step by step. Without the need of re-installing or completely formatting anything, please.