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→Initial setup (Ubuntu)
Before you can use the cores you've downloaded in Retroarch, you need to set the path to the libraries in '''retroarch.cfg''', the configuration file for Retroarch. Run Retroarch at least once to create a skeleton retroarch.cfg. By default, retroarch.cfg will be created in the directory '''$HOME/.config/retroarch''', where $HOME is your home directory. If retroarch.cfg is not found at that location, run Retroarch and choose the '''Save Config''' option - Retroarch will save a new configuration file and display its path on screen. Alternatively, you can use the '''find''' command:
find ~ -name "retroarch.cfg"
Next you need to locate the directory in which the libretro cores are stored. They should have been saved in the directory '''/usr/lib/libretro'''. You can check this by entering the command
ls /usr/lib/libretro
You should see a list of all the cores you downloaded. If the directory does not exist, you can find where the cores were saved with the find command:
sudo find / -name "libretro"
find may return several directories. Use '''ls''' to check each one until you find the downloaded cores.
Once you've located the libretro cores, it's time to open retroarch.cfg using your editor of choice. Look for the option '''libretro_directory''', which may be located near the bottom of the file. Insert the path to the libretro cores between the quotation marks on the right hand side. Assuming the cores are located in /usr/lib/libretro, the line in the configuration file should look like
libretro_directory = "/usr/lib/libretro"
You can also set the libretro path using the RGUI. In Retroarch, go to Settings -> Path Options -> Core Directory and navigate to the appropriate folder. If you set everything up correctly, you should see the cores when you select the ''Core'' option in the RGUI.
===Other Distros===
