aPhoto is an Intuitive and Portable Program that Helps You Create a Text or Image Watermark

Install

    No need to install, just decompress your downloaded package of aPhoto.
    If what you used is Ubuntu and its version is Saucy (13.10), Raring (13.04), Quantal (12.10) or Precise (12.04),
You can search and install aPhoto in USC(Ubuntu Software Center).
Or you can install it at command line:  

sudo apt-get update
sudo apt-get install aphoto