I'm having some troubles with reinstalling ubuntu on my Acer Aspire E15 laptop.
I made a bootable usb with Ubuntu Server on it.
If I try to boot it in UEFI mode (the mode that I've already used to install the current Ubuntu 16.04, needed because otherwise I had problem turning off the pc) the USB doesn't show up at all.
Instead If I try to boot in legacy mode, it shows up but gives the error "No bootable device -- Insert boot disk and press any key" when selected.
Hope I'm not posting it in the wrong section, does someone know what the problem might be?