The trash folder is found at:
.local in your home folder using the file manager, go to
View -> Show Hidden Files (in 13.04 and 13.10:
Files -> Preferences -> View tab -> Show Hidden and backup files) or just type: Ctrl+H.
If you deleted something as root (e.g. deleted a file using Nautilus invoked via
gksu), it is at:
Trash folder is first created when a user deletes a file. Within that folder are three directories:
files, where the deleted files are stored until the trash is emptied;
info, which stores information on where the files once were and when they were deleted; and
expunged, to which files are briefly moved when the trash is emptied (but may contain some owned by other users from directories you deleted).
Note that using the
rm command or hitting Shift+Delete will permanently delete your file and not send it to a trash folder.