I have uploaded like 50 games .gba but i dont see either gbc or gb file in the MGBA folder is it normal ?
Thanks for the feedback 
Yes, edit your action.config and add gb and gbc extension How to add new emulators (Gameboy, SNES, etc.)
ROM=/home/cpi/games/MGBA
ROM_SO=/home/cpi/apps/emulators/mgba_libretro.so
EXT=gba,gb,gbc
LAUNCHER=retroarch -L
TITLE=MGBA
SO_URL=http://buildbot.libretro.com/nightly/linux/armv7-neon-hf/latest/mgba_libretro.so.zip
Either that or use a gb/gbc emulator like gambatte
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Out of curiosity, why is the title “SNES” for MGBA?
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Haha I didnt have my gameshell and copied the content from the How to add new emulators (Gameboy, SNES, etc.) thread and did it by hand.
Title doesn´t change anything relevant, should work, its just what you would see in the screen when you select that icon.
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I loaded my GB games to the mgba folder, and my gameshell didn’t show the games I loaded. Then I changed the “. gb” to “.gba”, then I can play my old gameboy games.