As passive units only are useful for ordering things within the initial
transaction there is no point in ever activating them manually, hence
refuse it.
[Unit]
Description=Local File Systems (Pre)
Documentation=man:systemd.special(7)
+RefuseManualStart=yes
[Unit]
Description=Host and Network Name Lookups
Documentation=man:systemd.special(7)
+RefuseManualStart=yes
[Unit]
Description=User and Group Name Lookups
Documentation=man:systemd.special(7)
+RefuseManualStart=yes
[Unit]
Description=Remote File Systems (Pre)
Documentation=man:systemd.special(7)
+RefuseManualStart=yes
[Unit]
Description=RPC Port Mapper
Documentation=man:systemd.special(7)
+RefuseManualStart=yes
[Unit]
Description=System Time Synchronized
Documentation=man:systemd.special(7)
+RefuseManualStart=yes