我有一个来自使用了 5 年的 Linux 系统的 splash.png 图像，可以在 Grub2 上运行。
我刚刚安装了 Ubuntu 18.04 并将图像放在了 中/boot/grub/splash.png。
我跑了sudo update-grub，但没有检测到。
因此我添加了/etc/default/grub以下内容：
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=menu
GRUB_TIMEOUT=10
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="maybe-ubiquity splash"
GRUB_CMDLINE_LINUX=""
GRUB_BACKGROUND="/boot/grub/splash.png"
# Uncomment to enable BadRAM filtering, modify to suit your needs
# This works with Linux (no patch required) and with any kernel that obtains
# the memory map information from GRUB (GNU Mach, kernel of FreeBSD ...)
#GRUB_BADRAM="0x01234567,0xfefefefe,0x89abcdef,0xefefefef"
# Uncomment to disable graphical terminal (grub-pc only)
GRUB_TERMINAL=console
# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
GRUB_GFXMODE=1680x1050
# Uncomment if you don't want GRUB to pass "root=UUID=xxx" parameter to Linux
#GRUB_DISABLE_LINUX_UUID=true
# Uncomment to disable generation of recovery mode menu entries
#GRUB_DISABLE_RECOVERY="true"
# Uncomment to get a beep at grub start
#GRUB_INIT_TUNE="480 440 1"
我跑了sudo update-grub，但仍然没有检测到：
one@localhost:~$ sudo update-grub
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-4.15.0-36-generic
Found initrd image: /boot/initrd.img-4.15.0-36-generic
Found linux image: /boot/vmlinuz-4.15.0-29-generic
Found initrd image: /boot/initrd.img-4.15.0-29-generic
done
这是我的/boot/grub/grub.cfg文件http://dpaste.com/33A8MRT
为什么我的启动画面没有被检测和显示？启动时 grub 只显示默认菜单，没有启动画面。