I just put Ubuntu 18.04 on my laptop recently. It came with Windows 10, and I installed Ubuntu alongside with it. It should have 400 GB, but it’s saying I only have 175.3 MB of space left. I’m wondering if I partitioned it wrong.
Also, when I first tried to install gparted, it gave me a message about low disk space. I ran autoclean and autoremove, and then I was able to install it. This is what gparted shows for my partitions.