When I put my DVD-ROM and select the option to install Ubuntu, a black screen appears that says:
Couldn't get size: 0x800000000000e
MODSIGN: Couldn't get UEFI db list
Couldn't get size: 0x800000000000e
All the answers that I found on the internet were talking about disabling Secure Boot, but my motherboard doesn't support UEFI, so I don't have this option. What should I do?