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Visual Basics for Ubuntu?
As you most likely know VB is windows only, although if you use the wine application you can run a large number of VB programs on *nix. According to wine's appdb VB6 (the IDE) also works through wine (minus some ActiveX controls). Of course coding in C++ or Java would just be a much better solution.
If you were talking about VB.NET (or any .NET), then look at the mono project to run those applications on *nix.
virtual box does that. http://www.virtualbox.org/