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Deleted 2 20GB zips, no space freed up [closed]

Recently deleted 2 20GB gzip files from my Ubuntu. They did not appear in the Trash, and 40GB of disk space remains used. I searched all trash folders and they are empty. The files that were ...
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How do I free hard disk space allocated by Virtual Box disks?

I had multiple Ubuntu VM's installations, and the host is also Ubuntu 10.04 LTS. After I deleted the VM's, the space wasn't reallocated to the host. Do you know any solution?