I use to develop in VB and .NET but I moved to linux so I need that change

This is a non-Perl solution, but you might consider lookin into Java.

Java is in many respects inferior to Perl (what isn't?), but it is still a much better language than VB, and it is particularly good for creating graphical user interfaces, which is Perl's biggest weakness, and which I presume is most of what you're interested in doing if you were formerly using VB.

The freeness (in the Stallmanesque sense) of Java is a subject of some debate, but if your main interest is in not needing to pay money, it will fit that bill nicely, from what I am given to understand.