Yay, one problem fixed.
Did you already installed some cores? Try to go into Load Core > Download a core
If my memory isn’t tricking me, when using the PPA, you need to install the cores using the terminal. But I can’t assure that.
If that’s was true, was another reason who made me change for flatpak.
No, I have not installed any cores. I tried Load Core> Download a core and it said fetching core list.
Not sure if things are as they should be. This is new to me.
https://docs.libretro.com/guides/download-cores/
Yep, was like I thought. When using the PPA, you need to install cores via terminal… This is a pain…
If you take a suggestion, I really recommend that you try to remove the PPA install, remove the repo and then try to install via flatpak. By using the flatpak, you will be able to use the core downloader and update with no problems.
It will make things REALLY easier for you.
that hasn’t been the case for a while, actually, we just haven’t updated the doc. There are cores in the PPA but by default it uses the Online Updater.
I use (and maintain) the PPA myself.
Oh, I didn’t aware of that. I left Mint/Ubuntu since 2019.
I can take the suggestion no problem.
However hunterk and alexb3d are helping me in another thread with the PPA.
I’m thinking I should let them know I’d like to proceed with your suggestion and remove the PPA and try the flatpac.
Don’t want to frustrate my help. I’ll wait a few minutes and think on this before I do anything.
go for it. Whatever gets it working for you 
No problem, my friend. The good thing about Linux is that you have a lot of options and possibilities to make things works for you.
You just need to measure what is the best and easier for your needs. Glad to help!!
Ok, the PPA has been removed.
Should I install the flatpac from the Linux Mint Software MGR? Or elsewhere?
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.
