GBA Emulator for Linux OS?

Is there such a thing? I have been looking around, but have found nothing. Does anyone out there know anything of that?

Well, you could use Wine, a (sort of) Windows emulator. Then just run a GBA emulator on top of that.

Visual Boy Advance is available for Linux. It should be in most distributions repoisitories.
http://vba.ngemu.com/
http://fms.komkon.org/VGBA/A good front I have found is RbVBA
http://www.users.waitrose.com/~thunor//rbvba/Visual Gameboy Advance works pretty well

I use a flash cart, but for testing roms I use VBA Express. In Kubuntu I use it, try

sudo apt-get install vbaexpress

Or yeah Wine VBA EXE for windoze.I am in Kubuntu now, I was surprised u could get emulators, just start up a package manager (Adept, Add/Remove, Easy Ubuntu, Automatix) and there are emus right there, there are GBA and SNES, probably more, what Distro you got?

sudo apt-get install wine

Wine runs Windoze programs on Linux. I don't know if it will work for you because you may not have Kubuntu. But if you have Wine, you can run No$GBA on Linux, but not VBA (I tried it, it didn't work).

not all programs work in wine

I know that.

other people who read this thread may not. The general rule is, if theres a native linux program that does the job, use that.