I'm trying to setup my desktop and laptop to multi boot different distros without going into the Bios. So far everything I've tried has ended up with one of the distros not booting or booting into rescue mode.What I've tried so far* Partition hard drive, install distro 1 with encrypted LVM, install distro 2 with encrypted LVM. Install grub to mbr after each install. Only last distro boots.I've also installed distro 1, copied /boot to flash drive. Installed distro 2 and formatted /boot then copied /boot to flash drive. Did a compare copied over all the config-kernel-amd64, initrd.img-kernel-amd64, System.map-kernel-amd64, and initrd.img-kernel-amd64 from 1st distro 2 /boot. Then I copied the menu entries from /boot/grub/grub.cfg on the first distro to the 40_custom.cfg and ran update-grub. Rebooted, picked distro 1 and I got an error message about a start job running. This was followed by loading emergency mode.Most of the guides online guide you how to install Windows or Mac on non encrypted drives and install Linux last to update the boot record with grub. I think my main issue is problems with booting encrypted drives and modifying the grub menu entries properly.I'm currently reading the grub2 documentation (130 pages) and have installed to two different drives on the workstation as a workaround but would like to get this working properly for my laptop.My questions are how do I A) manually boot an encrypted lvm?B) properly update grub so I don't have to go into BIOS to boot separate drives?C) same as B but using partitions instead of separate drives.Thank you.
Multiboot Different Linux Distros
grub2;dual boot;lvm;disk encryption