A month ago I installed Lubuntu 18.04 to my new Acer a315-21. I downloaded the .iso, used Rufus to make a bootable USB Stick, and then installed it to my hard drive. Everything worked fine until today when I pressed the F2 key to go to the BIOS and discovered that the Boot Priority order is completely blank (i.e. it displayed some dots). Even with a USB (Puppy Linux iso burned with Rufus) inserted it does not detect it. How do I boot into USB, and is this normal?
Please note that I have encryption enabled, Lubuntu is now at 18.04 and inside Lubuntu everything works fine (i.e. the drive is detected).