Sorry for what is probably not the hardest question.
I've been using ubuntu for a while but I've recently installed it on a new computer, and filled a blank hard drive with it. Now i wish to shrink ubuntu's partition but GParted won't allow me to do it because there is no space available on the partition, but viewing the properties of the partition says only 6.6GB have been used of 2.8TB
Here is my GParted window:
And this is what i see when i right click in Files:
I'm trying to shrink /dev/sda3 by 2TB but GParted says that it is full... Can anybody help?