If there are two drives in a machine then LInux will see the first drive as sda (sata drive a) and the second drive as sdb (sata drive b). The Ubuntu installer defaults to installing the boot loader (Grub) onto sda. It does this even if we are installing Ubuntu onto sdb. So, at some point during installation we need to direct the installer to put the boot loader on to sdb. There is usually a panel with a drop down menu offering different locations - drives or partitions to put the boot loader in.
Now if you are sure that the 4 TB drive is sdb, then these two commands will fix things. Run from Ubuntu on the 4 TB drive.
Code:
sudo grub-install /dev/sdb
sudo update-grub
Do not forget to enter the BIOS utility to set the motherboard to boot from the 4 TB drive. Before you move this 4 TB drive into a machine with a UEFI motherboard make sure that Ubuntu is using an open source video driver. You do that in Additional Drivers. Otherwise the proprietary video driver that is being used may be incompatible with the video adapter in the new machine.
Regards.
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