Trash files are not completely deleted.

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BleachBit removes some, but not all of the files in Ubuntu system's Trash folder. I would appreciate any help.

Update: I think the files that BleachBit couldn't remove had some thing wrong with their system mapping. They (a video and a pdf) would open from the Trash view. But when I tried to move them, they vanished. Since then BleachBit has been removing all of the files from the Trash folder.