diff --git a/biglinux-livecd/usr/share/biglinux/calamares-profiles/bigcommunity/modules/services.conf b/biglinux-livecd/usr/share/biglinux/calamares-profiles/bigcommunity/modules/services.conf
index fe42f9c..d0485ab 100644
--- a/biglinux-livecd/usr/share/biglinux/calamares-profiles/bigcommunity/modules/services.conf
+++ b/biglinux-livecd/usr/share/biglinux/calamares-profiles/bigcommunity/modules/services.conf
@@ -39,9 +39,22 @@ units:
     - name: cups-browsed
       action: enable
       mandatory: false
+    # One of these three is what the edition installed: sddm on KDE, gdm on
+    # GNOME, lightdm on Cinnamon and XFCE. The displaymanager module only
+    # configures the display manager - the session, the greeter, autologin -
+    # and never enables its unit, which is this module's job, so listing only
+    # sddm here left a GNOME or XFCE install with no display-manager.service
+    # and a text login on first boot. Enabling a unit that is not installed is
+    # skipped because none of them is mandatory.
     - name: sddm
       action: enable
       mandatory: false
+    - name: gdm
+      action: enable
+      mandatory: false
+    - name: lightdm
+      action: enable
+      mandatory: false
     - name: graphical.target
       action: set-default
       mandatory: false
diff --git a/biglinux-livecd/usr/share/biglinux/calamares-profiles/biglinux/modules/services.conf b/biglinux-livecd/usr/share/biglinux/calamares-profiles/biglinux/modules/services.conf
index fe42f9c..d0485ab 100644
--- a/biglinux-livecd/usr/share/biglinux/calamares-profiles/biglinux/modules/services.conf
+++ b/biglinux-livecd/usr/share/biglinux/calamares-profiles/biglinux/modules/services.conf
@@ -39,9 +39,22 @@ units:
     - name: cups-browsed
       action: enable
       mandatory: false
+    # One of these three is what the edition installed: sddm on KDE, gdm on
+    # GNOME, lightdm on Cinnamon and XFCE. The displaymanager module only
+    # configures the display manager - the session, the greeter, autologin -
+    # and never enables its unit, which is this module's job, so listing only
+    # sddm here left a GNOME or XFCE install with no display-manager.service
+    # and a text login on first boot. Enabling a unit that is not installed is
+    # skipped because none of them is mandatory.
     - name: sddm
       action: enable
       mandatory: false
+    - name: gdm
+      action: enable
+      mandatory: false
+    - name: lightdm
+      action: enable
+      mandatory: false
     - name: graphical.target
       action: set-default
       mandatory: false
diff --git a/biglinux-livecd/usr/share/biglinux/calamares-profiles/xivastudio/modules/services.conf b/biglinux-livecd/usr/share/biglinux/calamares-profiles/xivastudio/modules/services.conf
index fe42f9c..d0485ab 100644
--- a/biglinux-livecd/usr/share/biglinux/calamares-profiles/xivastudio/modules/services.conf
+++ b/biglinux-livecd/usr/share/biglinux/calamares-profiles/xivastudio/modules/services.conf
@@ -39,9 +39,22 @@ units:
     - name: cups-browsed
       action: enable
       mandatory: false
+    # One of these three is what the edition installed: sddm on KDE, gdm on
+    # GNOME, lightdm on Cinnamon and XFCE. The displaymanager module only
+    # configures the display manager - the session, the greeter, autologin -
+    # and never enables its unit, which is this module's job, so listing only
+    # sddm here left a GNOME or XFCE install with no display-manager.service
+    # and a text login on first boot. Enabling a unit that is not installed is
+    # skipped because none of them is mandatory.
     - name: sddm
       action: enable
       mandatory: false
+    - name: gdm
+      action: enable
+      mandatory: false
+    - name: lightdm
+      action: enable
+      mandatory: false
     - name: graphical.target
       action: set-default
       mandatory: false