I created a bootable usb as well as a bootable cd to install ubuntu. Unfortunately, my medion PC (running windows 10) does not detect neither the usb nor the cd. I am pretty sure that these bootable devices were properly created as I can start from them on hp computer.
I tried refind but the bootable usb and cd are not detected either.
I disabled the secure boot in the efi as described in several forums. It did not bring anything. I have not the option to use the legacy bios.
I tried other linux distributions I get the same: bootable devices are not detected. Only bootable windows installation usb or cd are detected. Can you give me some hints?