1. Try creating your installation USB with rufus.....and the circled settings below. Before you click "start", double check and make sure the settings haven't changed.
Image may be NSFW.
Clik here to view.
2. Make sure secure boot is enabled. Don't use legacy.
3. Enable the F12 boot menu in the BIOS.
4. For testing purposes, don't put them at the top of the boot order.......which means Windows will boot by default.
5. From what I remember, the only thing I added to the trusted secure boot settings was "Grub"....after I read eelcoherders post. Because I'm pretty sure his post only says to add Grub. Not sure if it matters. Maybe I added the other file too and just can't remember.
6. Hit the F12 key when you see the Acer screen to boot your USB media. You've got to be quick on that F12 tap.
7. I assume you have set a supervisor password. I didn't set a user password. Only set a supervisor password.
8. I don't know if it matters, but I do have an HDD password. I really doubt that matters. Just letting you know that in full disclosure. My only BIOS settings that are different than default are:
A. Supervisor password
B. HDD password
C. F12 boot menu enabled
D. Added grub to trusted secure boot as per eelcoherder's post.
I don't know why you can't get it to work.
About 5 or 6 other people have had problems on various models. Honestly I don't know if it's user error or a BIOS problem or a combination of both. One person had to resort to using an external DVD. But another person tried the external DVD and couldn't even get that to work.
That's all I know.
If I had your computer sitting in front of me, I could tell you in 2 minutes if it's a BIOS problem or not.
I have installed both Ubuntu 16.04 and Mint 18 Sarah and didn't have any problems. But I do boot to Windows 10 by default. I don't toggle F6 to change any order. If I want Linux, I just hit F12 at boot. I don't have your computer model.