If you do not resist to try Gimp interface integrated in a single window, you can try installing the development version. Although version 2.8 will be released in December, and you can start testing some new features.

Thanks to ubuntizandoelplaneta.com to develop this installation guide that is compatible with several versions of Ubuntu, Jaunty, Karmic and Lucid. The steps are as follows:

Add the repository development and reinstall gimp normally.

$ Sudo apt-add-repository ppa: matthaeus123/mrw-gimp-svn

$ Sudo apt-get update & & sudo apt-get install gimp
Note: You may have a problem starting GIMP for the first time. The solution is to install libgegl:

sudo apt-get install libgegl-0.0-0