Case: Moving an SSD/HDD drive from one machine to another produces the error and interrupts the boot process.
When a Linux-installed drive is taken from a more-capable computer and hooked to a less-capable one this error is produced.
Basically, the original configuration is UEFI capable and this one isn’t, hence trashing the bootloader. A similar case was discussed on StackExchange where the issue was encountered due to a lack of support for RAID on the second machine.
- Changing BIOS settings to reflect the first rigt; ex: turning on UEFI, disabling RAID, whatever is appropriate.
- Reportedly, reinstalling GRUB in the appropriate boot mode can work
- Reinstalling Ubuntu in the appropriate boot mode, as a last resort