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Distribution: Mainly Devuan, antiX, & Void, with Tiny Core, Fatdog, & BSD thrown in.
Posts: 5,493
Rep:
It is better to use UUIDs or labels for external devices over /dev entries because /dev entries can change at boot up.
However, in your case, you will likely find that your grub config file is trying to boot from /dev/sdb when it is actually booting from /dev/sda, the first disk found by the BIOS.
The remedy is to change sdb to sda in your grub config file.
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