If you want to check your server disk space in Ubuntu run the following command:
df -h
You will get something like this:
Filesystem Size Used Avail Use% Mounted on
udev 462M 0 462M 0% /dev
tmpfs 99M 7.0M 92M 8% /run
/dev/sda 25G 15G 8.2G 65% /
tmpfs 493M 0 493M 0% /dev/shm
tmpfs 5.0M 0 5.0M 0% /run/lock
tmpfs 493M 0 493M 0% /sys/fs/cgroup
/dev/loop0 90M 90M 0 100% /snap/core/8268
tmpfs 99M 0 99M 0% /run/user/1000
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