I've been trying to dual boot Ubuntu with Windows 10 on my laptop (Acer Aspire s). Whenever i try and boot from a USB i get an error saying "System doesn't have any USB boot option. Please select other boot option in boot manager menu" and then takes me to a menu where i can choose Windows 10 or Linpus Lite.
As an experiment i tried booting a DVD instead (without connecting any DVD reader, my laptop doesn't have a DVD reader either) and it gave me the same error, except it said "... DVD boot ...". Does anyone have any idea why this is happening and also any solutions so i can get Ubuntu installed?
I've now also tried to turn of secure boot which didn't help. After that i tried going to Legacy mode, which did seem to work. But then the laptop didn't recognize windows and could only boot into Ubuntu. If i then tried to install Ubuntu it again wouldn't recognize Windows on the SSD. And since i'm inexperienced with this kind of thing i didn't wanna take the chance and try to install Ubuntu.