If you want to make sure that there is any leftover, try to run this in terminal
sudo apt purge --auto-remove retroarch
After that, remove the ppa repo from the lists, and do an apt update
Now for the flatpak. I assure that you are using a version of Linux Mint above 18.3, right? If so, just open the terminal and then:
flatpak install retroarch
Press Y to confirm. This will install RA and a lot of dependencies. No worries, that’s normal and take more time and space then a normal install.
The Retro Arch flatpak installation was successful.
I’ll be back later, got a few things that need tending to. Thanks! 
Now I should be able to launch Retro Arch and go and use the Online Updater, right? McCloud?
Exactly. Look for a shortcut at the programs list or run this in terminal.
flatpak run org.libretro.RetroArch
Probably you will have the same problem with the unreadable text, but just follow the steps above and you’ll be fine.
Notice that you can install and update all cores, assets and other things using the online updater inside RA, but if a new version of RA was released, you’'ll need to update via terminal. Just use
flatpak update
Now, if for some reason you need to access the RA folder, it’s hiding inside your /home. Open nemo, press Ctrl + H to see the hidden folders and look for .var/app/org.libretro.RetroArch/config/retroarch/. Everything you need will be inside that folder.
The Online Updater worked flawlessly and the Cores that I’m downloading for Arcade is working! I’ll have to go through the API and get used to it. I’ve got some BIOS files and ROMS already in my Home directory.
Thanks bro!
I don’t know how to start or find a game so I have some things to learn.
First of all, I strongly recommend to put all your roms inside a single folder and separate by system. Something like:
/roms/nintendo/nes
/roms/nintendo/snes
/roms/nintendo/N64
/roms/sega/32x
/roms/sega/genesis
/roms/sony/PS1
Then open RA. Go to Settings > Directory > File Browser and set this to your roms/ folder.
Now, about playlists. You are new at this, so let’s make things easier. Now let’s assume you want to create a Super Nintendo games playlist:
Go to import content > manual scan. You will see this screen.
Point to your Snes roms folder, set the system name, go down and start scan. There is no need to mess with these other options now.
There you are. You now have a Snes playlist. Repeat it for every system you want.
Thanks, I’ll do this tomorrow. I’ve learned with Linux not to do anything when I’m tired and new to something. You agree?
Yeah sure. Take your time.
OK, I think I understand what you mean but I’ll ask as I don’t like to assume anything.
I placed 5 Nintendo rom files in my ROM directory so that’s done. Do you mean for me to make a sub-directory of the Nintendo SNES files within the “ROM” directory that I created?
That’s right. roms/Snes and put all the snes games inside.
Of course you can just put all your games inside the roms/ folder. But I think that is better to just keep the games organized, because if something happen, you know where to find.
Here, look how I keep mine. It’s just an example. You can arrange your games the way you prefer.
Thanks, McCloud:-
I get it now and I agree with you, it’s better to keep the games organized. Over the weekend I’ll be able to download all the games rom’s and organize them into directories. Then I’ll come back and follow the rest of your instructions to open RA Go to Settings and etc.
For the BIOS files do I just need a Retro Arch BIOS Pack like in my screenshot? OR> do I need more Bios files than that?
How do I actually launch a game that I want to play?
You need to unzip the contents of that zip inside the “system” folder on Retroarch directory. .var/app/org.libretro.RetroArch/config/retroarch/system/
If you want to know if some bios are missing, open the desktop view by pressing F5, go to playlist and check. If something is missing, you will see a Red Line at the right.
Go to Load content, find your rom folder and select the game and the proprer core. Or make a playlist for that system.
Thanks for the instructions and the details. I’ll work on this over the weekend and come back on Monday or Tuesday to say how things went.
Enjoy your weekend McCloud:-
If you are just starting in this world, I am going to give you the basic steps.
RetroArch has very good documentation and many doubts are already answered, if this is not your case, new publications are welcome.
You need to unzip the contents of that zip inside the “system” folder on Retroarch directory. .var/app/org.libretro.RetroArch/config/retroarch/system/
I found the path in your directions above. I extracted the RABIOS Pack. Is this correct?
That link you posted alexb3d is very helpful. Thank you.
Just put the zip inside the folder doesn’t work. You need to extract their contents.
Pay attention at the path. You have a system folder inside the system folder. The bios needs to be placed at the first level. Go inside that sub system folder, Ctrl A + Ctrl X, go up a level and Ctrl C.
