Cuphead on Ubuntu 24 with ProtonGE Latest

Attempt to launch through Heroic Launcher, the game opens and immediately closes

Solution

flatpak update

flatpak update

should have some updates (specifically

org.freedesktop.Platform.GL.nvidia-575-64-03

org.freedesktop.Platform.GL.nvidia-575-64-03

and its 32-bit counterpart). Install those

Cuphead on Ubuntu 24 with ProtonGE Latest - Heroic Games Launcher