I literally just copied my desktop's Debian install onto a flash drive & ran systemd-boot installer from chroot (after mount --bind'ing some drives in) and, boo

I literally just copied my desktop's Debian install onto a flash drive & ran systemd-boot installer from chroot (after mount --bind'ing some drives in) and, boom, had a great OS that I knew worked for me! (Some other thanks also required i guess. Regen your machine-id. I use the auto-mounting partition types but if you don't (most people don't), update your fstab and kernel cmdline.)