The boot-repair log is here: http://paste.ubuntu.com/5834813/
My laptop is: Acer E1-571
In the UEFI setting, it can not disable the secure boot for UEFI mode.
In the ubuntu installation steps, it can not detect the pre-installed windows8(can not see "Install Ubuntu alongside others"). So, the only thing I can do is choose the "something else", manually install ubuntu with windows8.
After installation , I only saw the ubuntu. So, I ran boot-repair. But it did not work.
And the bios also report "windows Boot manager has been blocked by the current security policy" just after pc power on.
So, I set the mother board setting in legacy bios mode, hope the boot-repair save me this time. But this time even worse, for that I can not finish ubuntu installation. It said that something failed. Sorry I did not write down the error message, at that moment I was exhausted.
Open this thread, I only wish could give other people information. I will install ubuntu without windows8.