UEFI boot of the machine is a two-disk WIN10 + Ubuntu18.04 dual system, installed in a case where an existing Ubuntu WIN10
Now recording uninstall process
System disk partition, circled in red is the Ubuntu installation position, followed by a swap partition is not necessary and unnecessary efi boot partition, and root and home partitions
Then remove the boot, here I use the operating pe
I use this bootice software, of course, can have a choice, I chose this software just because I use on PE only this.
After clicking UEFI Click to modify the startup sequence, and then enter the following figure
Select ubuntu, then click Delete to note that this deletion step is not recognized, tap to delete not negotiable.