I hope this is not too much of a duplicate, I tried checking out old questions and answers but without luck, UEFI has been giving problems for 3+ years now but still I struggle with it.
Here's the situation: I have an ACER Aspire VN7, I am trying to install Ubuntu 15.10 on it with dual boot (leaving the original windows 10 aside). But I can't succeed making the pc see the Ubuntu USB stick, no matter what.
As advised, I disabled Windows quick startup from the control panel, disabled the security lock in the BIOS (but there doesn't seem to be any quick startup option to disable there), but still the machine will ignore the bootable USB stick altogether.
I also tried Rod Smith's rEFInd alongside, as he suggested on some old answer. The result is that my pc boots on rEFInd as it should but still ignores the Ubuntu USB (not even within rEFInd does it show up as an option).
I managed to successfully boot from the same Ubuntu 15.10 USB stick after switching the BIOS boot to Legacy instead of UEFI, but UEFI has been standard for Windows for at least 3 years now and I would definitely prefer if a UEFI solution could be found.
I will be very grateful to anybody who could provide advices or insights!