Superb applications for graphics or photo processing darktable and rawtherapee

If you need to process images, use darktable and rawtherapee

To install in Xubuntu or Ubuntu, open a terminal window and enter the following commands:
$ sudo apt-get install darktable rawtherapee <enter>

Once you are done, go ahead and process photographs like a professional. Need I say that this is a good combination to substitute for LightRoom available at, that costs a fortune and is not available for Linux