I'm using GParted to resize my partitions on Linux. There is about 5GB of unallocated space following the partition sda5. However, when I right click on sda5 and select 'resize/move', it doesn't show the 5GB of unallocated space. So I can't increase the size of sda5 (can't drag to the right, or increase the number for file size. It shows the 'free space following' the sda5 partition as 0, even though there actually is 5GB of unallocated space. Why can't I expand my partition?