https://drive.google.com/folderview?id=1pljOCSln5zwNsQO5gcv5Kx1qNM7KH-Uh
Please refer to the above link. My 19GB / partition is 100% full. I understand that root / partition /dev/sda8 is filled, but I guess I was expecting partition /dev/sda6 to get filled because that's where it shows 80GB space. I'm unable to install anything now.

