Sometimes if the files are locked you cannot empty the trash can. Some files will simply not be deleted.
To solve this you can simply do this:
Hold down option/alt key and click Empty on the Finder menu
Hold down option/alt key and click Empty on the Finder menu




MacBook Pro15'', late 2011
Processor 2,2 GHz Intel Core i7
Memory 8 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6750M 512 MB
Software OS X 10.8.2 (12C60) - Mountain Lion

serial0.present = "TRUE"
serial0.fileType = "pipe"
serial0.yieldOnMsrRead = "TRUE"
serial0.startConnected = "TRUE"
serial0.fileName = "/Users/khaledsaied/Documents/Serial/empty"

serial0.present = "TRUE"
serial0.fileType = "pipe"
serial0.pipe.endPoint = "client"
serial0.yieldOnMsrRead = "TRUE"
serial0.startConnected = "TRUE"
serial0.fileName ="/Users/khaledsaied/Documents/Serial/empty"
cat /dev/ttyS0Then open Terminal on Ubuntu 2 and write following:
echo some random text > /dev/ttyS0
Now you should see the text "some random text" on the Ubuntu 1 Terminal.*It is ttyS0 because I have used serial0.