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On one machine I have an encrypted LUKS container around an LVM on /dev/sda that I can boot into. On the same machine is a second drive with an encrypted LUKS container around an LVM on /dev/sdb (that GRUB from /dev/sda doesn't see at the moment).

Ideally, I would like to have GRUB from /dev/sda ask if I would like to load Ubuntu /dev/sda or Ubuntu /dev/sdb.

How can I update GRUB located on /dev/sda so that it offers the two /boots (one on /dev/sda and one on /dev/sdb) as startup options?

  • sudo update-grub does not add the /dev/sdb option to the startup option list.
  • Boot-Repair also does not automatically do what I want.

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