Comment # 10 on bug 941758 from Thomas Leineweber

Although sleep has been moved to a subpackage of grub, there are some remains
in the systemd package (as shown in bug 991350):

* The script /usr/bin/systemd-sleep-grub is called from the systemd-units
/usr/lib/systemd/system/systemd-hibernate.service and
/usr/lib/systemd/system/systemd-hybrid-hibernate.service

> [Service]
> Type=oneshot
> ExecStart=/usr/bin/systemd-sleep-grub pre
> ExecStart=/usr/lib/systemd/systemd-sleep hibernate                  
> ExecStopPost=/usr/bin/systemd-sleep-grub post

* But this script has been removed with
https://build.opensuse.org/request/show/407291

This error exists at least in Leap 42.2.