Unless I made a mistake following the book, it seems 7.10-systemd installations are unable to boot into linux single-user mode without modification. When “single” is added to the kernel boot parameters, Systemd’s rescue.target (aka runlevel 1) looks for “sulogin” in a different location than where it’s installed by following the LFS book. Because of this, systemd just transitions on to the usual graphical.target mode (aka runlevel 5). I fixed this on my system by issuing:
sudo ln -s /sbin/sulogin /usr/sbin/sulogin I’m not certain what a better long-term fix for LFS is; move the sulogin executable (like “passwd” gets moved per LFS instructions after installing “shadow”), patch systemd to use the current location, or add a symlink like I did. Regardless it would be helpful to add this note to 7.10-systemd errata, and improve the next LFS-systemd release. Regards, -Eric S. Stone
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