I have an Ubuntu 11.04 64 bit development image running on VirtualBox. I have been doing some house keeping on the disk space because it was getting low. The drive is a 26GB drive. I have about 4.7 GB going to swap. That leaves about 21 GB of total space. I ran the Disk Utilization software and discovered some of the folders that were taking up too much space and deleted them. I also ran aptitude cleanup commands which freed about another 1 GB of space. Now I am sitting on 10.5 GB of used space. (Displayed in the Disk Usage Analyzer) Nautilus is only displaying about 7.5GB free space on the drive. That doesn't make sense in my mind. 21 minus 10.5 is not 7.5.
I wanted to make sure that those tools were not showing incorrect information so I ran a df -h. That displays 11G used and the size of the drive 20G. 7.5 Available. That still leaves a discrepancy of 1.5 GB.
I know you can't get exact but that discrepancy is huge. Is there anything that I could be missing?