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Use this command to check which directory is eating your disk space
cd / && sudo du -h --max-depth=1 .
It might take a while to get executed.
Hope this helps.
@Mohsen47 's answer is correct, but a cleaner solution is to install ncdu:
Ubuntu:
sudo apt-get install ncdu
CentOS/Fedora:
sudo yum install ncdu
Once installed, you can simply run this:
ncdu /