2018-07-30 Ubuntu installation

Ubuntu 16.04

• ultraiso
  3-4-7
  syslinux boot

• udisk

/boot   20G
swap    8G
/       200G
efi     20G
/home   1.7T

• no bootable devices found
  change legacy secure boot from OFF to ON.
  change uefi secure boot from OFF to ON ?

• Ubuntu不显示grub

首先备份/etc/default/grub文件 打开/etc/default/grub文件，找到

找到 GRUB_TIMEOUT=10 把10变成3,意思是等待3秒钟。

GRUB_HIDDEN_TIMEOUT=0 
#GRUB_HIDDEN_TIMEOUT=0 

sudo update-grub
sudo reboot