The systemd cryptsetup-generator wants systemd-random-seed-load.service
in case /dev/urandom is the device.
$systemdsystemunitdir/systemd-ask-password-plymouth.service \
$systemdsystemunitdir/systemd-journald.service \
$systemdsystemunitdir/systemd-vconsole-setup.service \
+ $systemdsystemunitdir/systemd-random-seed-load.service \
$systemdsystemunitdir/sysinit.target.wants/systemd-modules-load.service \
$systemdsystemunitdir/sysinit.target.wants/systemd-ask-password-console.path \
$systemdsystemunitdir/sysinit.target.wants/systemd-journald.service \