[ubuntu] ubuntu disc space

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http://ubuntuforums.org – Im getting a full indication on my shared ubuntu setup. After I did a search I found df -h and it identifies /dev/sda1 having 5.5gb used and I cant figure out why it is using so much. I did empty the trash as it mentioned per the warning. Also my shared says I am using 76gb. Ideas for cleaning house? (Hardware)