Why doesn't GRUB see the second OS with encryption?

Question

linux

Here is a sandwich. A laptop. 1 HDD. Two OS: Debian and Mint. Both use LVM and encryption. The /boot partition is taken out separately, the / partition and swap on the encrypted LVM partition (Same for both OSes). Grub only sees the system that was installed last. update-grub did not help. Can I somehow specify the /boot partition of the first OS manually?

Answer 1

As an option, add to grub.conf of the last installed system let it load the first installed system.