You do not have an EFI-System-Partition, so it is impossible to install Grub. Either you create an ESP on your disk or you boot the installer in BIOS mode.
I recommend to use GPT as partition table. ** Changed in: grub-installer (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1677358 Title: 'installation du grub 2 sur uefi To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1677358/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs