Man, I think you have done enough for me - thanks for your tutorial and link to Roscioli's work!
It is also possible to install G'mic for 2.8 on 10.04.
G'mic can be found here: http://sourceforge.net/projects/gmic/files/
and installed in .gimp2-8/plug-ins in your home folder. (Using ctrl+h to reveal hidden folders).
You can also copy over all brushes, gradients, palettes, etc. from Gimp 2.6/2.7 folders into their corresponding folders in 2.8.
Which basically makes Gimp2.8 complete on my system now.
I'm so happy!
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