You want to know more about your partitions and files sizes : here are the tools you need.

Carry on reading Disk, partitions & files →

Here are the commands to know the disks/partitions sizes and also the files sizes in the directories.

Carry on reading Linux command: size of disks and files →

Ever wanted to know why, on Ubuntu, the available disk space and the free disk space are not the same ?

Carry on reading Lost space on Ubuntu partitions →