I got it working by turning off UEFI mode during installation of Ubuntu server on the external hard drive. With this disabled I was able to install and then access GRUB2 from the boot menu and boot Ubuntu from there.
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I got it working by turning off UEFI mode during installation of Ubuntu server on the external hard drive. With this disabled I was able to install and then access GRUB2 from the boot menu and boot Ubuntu from there.