sudo pacman -S grub-theme-tela-color-1080p-git # 安装新主题(archlinux为例)
ls /usr/share/grub/themes # 查看现有的主题
sudo vim /etc/default/grub # 在/etc/default/grub添加
GRUB_THEME="/usr/share/grub/themes/tela-color-1080p/theme.txt"
# 重新生成grub.cfg文件
sudo grub-mkconfig -o /boot/grub/grub.cfg