A quote from wiki.ubuntu.com: “The GIMP has been removed from the default installation in order to make room for more features and content to be included in Ubuntu. Basic functionality for image editing provided by The GIMP can be found in some of Ubuntu’s other applications, such as F-Spot. The GIMP remains available in the package repository.“
In the next version of the well known Linux distribution Ubuntu (10.04 – Lucid Lynx) the Ubuntu developers decided to adjust the default applications. GIMP will be classified as software for specialists which means that GIMP will not be installed by default any longer.
This is how you can install GIMP from command line.
Open up the terminal and type:
$ sudo apt-get install gimp