Using a USB thumb drive to install all is well until near the end there is a message: The 'grub-efi-amd64 signed' package failed to install in /target/. Without the GRUB boot loader the installed system will not boot.
Then came the message: installer crashed
We're sorry ........
My pc has a ssd drive plus two hard drives. Win 10 is on the ssd and on the hdds besides data files there are various other partitions including Linux Mint. This is a new pc so my previous grub is not on this pc. If I can install ubuntu to one of the available partitions it should install grub.
I have tried installing ubuntu 18.04 in sda4 and sdb8[][1] several times. Each time I selected a different partition upon which to have the grub boot loader installed. Each time the installer installed most files, but when it got to installing grub I got the error message noted above.
Would the problem be that I am not using the correct partition for the grub boot loader? Or what?