Screenshot location

[Nopey]

You have the screenshot filepath set to /media/ramdisk
I think that /tmp is a better location, as its a standard ramdisk.
Alternatively, the creation of /media/ramdisk should be included in the installation guide.
Cheers!
config.lua:

-- filepath where current game's last screenshot will be saved
-- ideally on a ramdisk (for speed and less stress on the hard drive)
SCREENSHOT_FILEPATH = "/media/ramdisk/mario-ai-screenshots/current-screen.png"

[aleju]

Do you mean something like /tmp/ramdisk or just /tmp? I think /tmp itself is usually not a ramdisk. Might make sense to use /tmp/ramdisk - I don't know what the convention there is.

Btw, the readme contains under "installation procedure" a small chapter about the ramdisk stuff.

[Nopey]

/tmp is mounted as tmpfs on Ubuntu.
To see if it is mounted that way, you can run mount | grep tmpfs,
which will list all of the tmpfs mountpoints on your system.
Thanks, I see the section now.