Dear Maintainer,

I tried to use a text-based syslog (rsyslogd) exclusivly.
The start-script for journald was "masked" in systemd speak.
Can not remember os-prober's exact error message (somewhat missing "/dev/log").
Result was: only the installed debian appeared in grub's menue
(it's my productive system; there are Arch, Gentoo and fmw for playing around).
With journald unmasked again, os-prober is working too.
If you do not want to call it a bug, it is an unnecessary dependency on sytemd.

Anyway, thanks for your effort.
Regards,
Thomas