Re: How to resize Ubuntu partition with unallocated space w/GParted & LiveCD
You are booting from a USB or CD while you're trying to do this, right? Because, you can't work on partitions that are in use.
Have you run fsck on that partition? The screenshot is alarming because GParted doesn't show used and free space inside the partition. I would run fsck on it to see if there are any filesystem errors.
Ubuntu 16.04 Mate, Mint 18 Mate; MS Win 8.1, MS Win10 Pro.
Will not respond to PM requests for support -- use the forums.