Thank you for your help.
I got around it by booting older system and doing a grub fix.

On 05/06/18 05:56, Phillip Susi wrote:
> Your disk is currently partitioned to boot in bios mode, but you booted
> the installer in EFI mode. A warning message prompted you that this
> could be a problem and recommended performing a bios mode install
> instead, but you chose not to. You either need to perform the bios mode
> install, or partition the disk using GPT and set up an EFI system
> partition to install in EFI mode. This will be done for you if you
> choose the "use entire disk" guided install option.
>
> ** Changed in: grub-installer (Ubuntu)
>         Status: New => Invalid
>

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https://bugs.launchpad.net/bugs/1774286

Title:
  Ubuntu18.04 crashed on install - falied to install grub

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