Seems that the Linux binary was built with a glibc that's too new to run on somewhat older distros, like Ubuntu 20.04. I'd like to just build it from the source archive but I'm not sure how. Do you have instructions for that?
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That problem comes entirely from my own laziness, sorry about that. It's very hacked together because I built it on something I want to expand later, and most of it isn't in place yet, but unless I made a mistake with the source archive, you can put it into `~/quicklisp/local-projects/` and then `(ql:quickload :metacard)`, then `(load "bleach-2.lisp")`, then `(metacard::set-up-framebuffer)`, then `(metacard/glfw:make-os-window)`. Unless I made a mistake that should work.
Alternatively, you could run the Windows version in Wine, which seems to work perfectly.