在安装完 Ubuntu 18.04 后，本人遇到了 Ubuntu 无法在 Clover 中显示的问题，解决方案在此记录下来。
修改 Clover
将 Clover 中的 GUI - Scan 中的 Linux 选项勾选，如图
修改 Grub 等待时间
在 Linux 下修改 /etc/default/grub 文件（需要 root 权限），并运行 sudo update-grub。使其减少 grub 的等待时间，在这里我设置为 1s，可以将等待的秒数设置为更小，如 0.1s。但需要注意的是在 Ubuntu 18.04 不能设置为 0，参见 How to set GRUB timeout to 0 on Ubuntu 18.04
# If you change this file, run 'update-grub' afterwards to update
# /boot/grub/grub.cfg.
# For full documentation of the options in this file, see:
# info -f grub -n 'Simple configuration'
GRUB_DEFAULT=0
GRUB_TIMEOUT_STYLE=hidden
GRUB_TIMEOUT=1
GRUB_DISTRIBUTOR=`lsb_release -i -s 2> /dev/null || echo Debian`
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
GRUB_CMDLINE_LINUX=""
# 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=800x600
# 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"
Gist 地址： https://gist.github.com/rwv/664461cddf87bdfc4a97bef900f20268