Parkerman
If you are installing the new beta version 7 (for testing/evaluation) on Ubuntu and receive GTK warnings re a missing theme engine (mentioning module path/"pixmap") then you may need to run the following in the terminal before retrying:-
sudo apt-get install gtk2-engines-pixbuf
See specific details in a topic added under "The Brain 7 Beta"  as follows:-
http://forums.thebrain.com/post/Linux-install-issue-with-version-7.0.1.0-beta-5563435

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