Use "udevadm trigger --type=failed" instead of "--retry-failed", since the latter is gone as of udev-146. The former works in earlier versions as well, at least as far back as -143 (which includes the current book version).
git-svn-id: http://svn.linuxfromscratch.org/LFS/trunk/BOOK@9049 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689