The installer puts the theme files somewhere in /usr. If this folder is located on an encrypted partition, grub will not have access to it when booting and the theme will not work.
To solve this, the installer could ask whether you want the files in /usr or in /boot/grub
The installer puts the theme files somewhere in /usr. If this folder is located on an encrypted partition, grub will not have access to it when booting and the theme will not work.
To solve this, the installer could ask whether you want the files in /usr or in /boot/grub