Sometimes there are systems that seems to get clogged full of disk space and it may be unapparant where the space is being used.
I put together a couple commands to get a sense of the disk consumption.
Just copy and paste these into your terminal:
echo "Files bigger than 100Mb:"
find / -size +100000000c -ls |awk '{print $7" [...]
Where’s all that disk space being used?