Determining your system’s disk space on Linux is achievable from the command line interface (CLI). This value can change depending on free/available space.
Access the Linux command line.
Upon gaining access to the Linux command line interface (CLI), type:
This will provide a list of mounted partitions with six columns:
Filesystem Size Used Avail Use% Mounted on
These headers will be followed by the usage of the partitions/disks in easy to read format.
man fdisk -l