There are several places on the system that deleted files are stored.
It varies by which version of Ubuntu is running, the origin of the deleted folders/files, and who deleted them.
/usr ) and/or increase the On of the most common causes of disappearing disk space is a back up saved to the wrong location.
Improperly designating the back up location is a frequent cause.
Also keep in mind that there will, by default, be a 5% block reservation for the super-user per blockdevice (in short: for every seperate partition on a hard disk in your system). For 12.04 machines running the Trusty HWE kernel 3.13.0-55-generic #94~precise1-Ubuntu SMP, and Trusty machines themselves, the issue appears resolved..I wonder if it still affects machines on 3.2.0-86 *if* they had previously upgraded to the regression kernel last week?Now I just need to figure out why the disk is full (I'm a bit worried something malicious could be going on because none of the log files is taking up that much space and there's not much software installed, just a simple LAMP server)...It's possible that a process has opened a large file which has since been deleted.