@mitu I could solve the problem and now I can play the games.

The issue was with the bios file names. The files were in capital letters. I changed that and worked without inconvenient.

@CARRisma Wow! That's an awesome fix! Thank you!

@folly Thanks, I always read this topic, I like to walk around it and I always see interesting things.

@mitu Thanks for your help. It took me a while to confirm things to get back to you. I was wrong about the save states on the Megadrive Mini. The game saves are there. I thought I had to use the save states lest I lose the data.
I have successfully installed Retropie onto my Linux Mint desktop. Thanks!

The Sharp x68000 is a great platform for some real nice hidden gems. I just wish the emulators were better done with a more professional setup like the wonderful, FS-UAE emulator for Amiga computers. Because too many Sharp x68000 games require multiple disc and that part is not handled as well in these emulators.

@cmdima You can usually find the BIOS information in the Docs. Also, please don't bump ancient topics, it's bad forum etiquette.

@tuki_cat use the RetroArch RGUI and choose the options in the configuration. Or, modify the global config file in ’/opt/Retropie/configs/all’. Make sure you don't have config_save_on_exit options configured.

@krinasam Please don't bump old topics, you should open a separate topic for your question.

@jimbo will test and up swap if needed.