(Not sure if this belongs here)
I've been googling and asking but I can't seem to find a solution out there. I've noted that with LUKS/LVM "fully encrypted" setup, the root FS can't be cleanly unmounted. Obviously this is because it's in use and it's on top of LVM inside a LUKS container. I was wondering if there's a way to use busybox and/or kexec to move the root filesystem to an initrd/initramfs or some other virtual / ram-based root filesystem with just enough binaries to be able to cleanly unmount root, shut off LVM, and close LUKS. Does anyone happen to know of a solution?