mjhjmtu

I'm trying to setup a dualboot system, where I want the two OSes to be completely separated. I figured the best way of achieving this would be to use different /boot partitions and have one LVM group for each system.

At the moment I have Debian Stretch setup as follows:

$ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 465.8G 0 disk 
├─sda1 8:1 0 1K 0 part 
├─sda5 8:5 0 326.1G 0 part 
│ └─sda5_crypt 254:0 0 326.1G 0 crypt 
│ ├─debian--vg-root 254:1 0 307.4G 0 lvm /
│ └─debian--vg-swap1 254:2 0 18.6G 0 lvm [SWAP]
sdb 8:16 0 7.5G 0 disk 
└─sdb1 8:17 0 7.5G 0 part /boot

Here /dev/sdb1 is the boot partition on a USB-stick and the MBR is installed in /dev/sda.

What I'm trying to accomplish is to setup another identical system with its own LVM group and its boot partition on its own USB-stick.

I have tried setting up a new LVM group using the Debian installer, installing Debian in it and installing the boot partition to a separate USB-stick along with the bootloader. The installation succeeds without any issues but when I choose to boot from the USB-stick in the BIOS, the screen is just black with a flashing dash in the upper left corner.

The working Debian system does not find the newly installed Debian system using sudo os-prober so I suspect that the cause of this is that GRUB cannot find the new system.

How can I install Debian alongside Debian where each installation has its own LVM group and its own boot partition on its own USB-stick?