Disable UEFI in UEFI/BIOS settings and reboot. Windows is already installed using msdos partitioning on the hard drive and it is better to install Ubuntu using CSM/Legacy/BIOS boot when windows is installed that way
Disable UEFI in UEFI/BIOS settings and reboot. Windows is already installed using msdos partitioning on the hard drive and it is better to install Ubuntu using CSM/Legacy/BIOS boot when windows is installed that way