background
Lenovo computer is the author of the original system is Windows, previously asked people to Ubuntu Desktop 16.04 installed, want to change a new 18.04 recently, attempts to install itself
problem
Since before the dual system is installed, each time the computer needs to boot the system boot selection, that is, in a selected Windows and Ubuntu.
The relatively heavy Mang, Ubuntu directly to disk before allocated to format the partition, and did not deal with leading questions, so a boot caught in a black grub command interface (a little panic
solve
Has been plugged into the U-engraved Ubuntu .iso file, reboot, at boot time, and the Delete mad F2, into the interface Bios,
first Secure Boot to [the Disable]; then enter "Boot", the U disk is moved the top (USB it wants to find the words), if U disk is [Disable] should be changed to [Enable]
boot, select "install Ubuntu", entered the red Ubuntu interface you, continue to install it