I've been trying to change the grub (menu) background colour. No matter what I try the black grub menu will remain.
I've changed the plymouth theme elementary.grub file. Here are the contents of that file:
if background_color 44,0,30,0; then clear fi
This is copied from my Ubuntu 15.10 box where it works fine and any changes I do in the rgb value take effect.
I've tried a 3 variable rgb option as well (44,0,30) to no avail. Adding a space between the last value and the semi-colon does not make any difference.