My first guess, just the askubuntu link, was that it was a leftover from an old version of the grub-customizer package that hasn't been removed as it is in /etc and subject to conffile handling, but I'm not so sure that's entirely right, as I'd gathered that the old version was from before Disco and this is a fresh Impish install.
My first guess, just the askubuntu link, was that it was a leftover from an old version of the grub-customizer package that hasn't been removed as it is in /etc and subject to conffile handling, but I'm not so sure that's entirely right, as I'd gathered that the old version was from before Disco and this is a fresh Impish install.