I hit the same error. I began with the error and the fix from
https://issues.guix.gnu.org/23286 and then put xscreensaver into my screenlock
section of my config:
--8<---------------cut here---------------start------------->8---
(list (service gnome-desktop-service-type)
;(screen-locker-service xscreensaver) ;; this initializes, but
shouts a "do not run as root" error instead of running my images, and doesn't
accept my password
;;; other stuff
)
--8<---------------cut here---------------end--------------->8---
Now I have 'xscreensaver: don't login as root' on my screensaver, and no
images. As mentioned earlier, only the xscreensaver-auth program should be
setuid, not the whole thing, apparently.
