You can use two commands. The first is to use df - which according to the Ubuntu Manpage:

df - report file system disk space usage

Usage works like such:

df -h

Which should output something like this:

Filesystem            Size  Used Avail Use% Mounted on
/dev/vzfs              20G  3.5G   16G  18% /

The -h flag provides human readable output (which makes reading of the output - easier).

A second tool is with du which is a slower approach but will give you a better break down of a per directory. Information on that can be found in How to determine where the biggest files/directories on my system are stored?

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