Something like

@@ -576,9 +582,15 @@
                                 continue;
                         }
 
+                        g_debug ("considering %s", base_name);
                         if (get_session_command_for_file (self, base_name, 
NULL)) {
-
-                                g_sequence_insert_sorted (sessions, g_strdup 
(base_name), (GCompareDataFunc) g_strcmp0, NULL);
+                                g_debug ("yes, adding");
+                                name = g_strndup (base_name,
+                                                  strlen (base_name) -
+                                                  strlen (".desktop"));
+                                g_sequence_insert_sorted (sessions, name, 
(GCompareDataFunc) g_strcmp0, NULL);
+                        } else {
+                                g_debug ("no, not adding");
                         }
                 } while (base_name != NULL);
 
@@ -589,25 +601,22 @@
         name = NULL;
         session = g_sequence_get_begin_iter (sessions);
 
+        g_debug ("iterating the GSequence");
+
         if (g_sequence_iter_is_end (session))
                 g_error ("GdmSession: no session desktop files installed, 
aborting...");
 
         do {
                if (g_sequence_get (session)) {
-                       char *base_name;
-
-                       g_free (name);
-                       base_name = g_sequence_get (session);
-                       name = g_strndup (base_name,
-                                         strlen (base_name) -
-                                         strlen (".desktop"));
-
+                       name = g_sequence_get (session);
+                       g_debug ("iter: looking at %s", name);
                        break;
                }
                session = g_sequence_iter_next (session);
         } while (!g_sequence_iter_is_end (session));
 
         g_free (self->priv->fallback_session_name);
+        g_debug ("setting fallback_session_name to: %s", name);
         self->priv->fallback_session_name = name;
 
         g_sequence_free (sessions);

makes it start the ubuntu (wayland) session, but then GDM is constantly
restarting in a loop. Could just be some weirdness in my VM, looking.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-session in Ubuntu.
https://bugs.launchpad.net/bugs/1705157

Title:
  "Ubuntu" and "Ubuntu on Xorg" randomly start the same session (maybe
  Wayland maybe Xorg)

Status in gnome-session:
  Confirmed
Status in gdm3 package in Ubuntu:
  In Progress
Status in gnome-session package in Ubuntu:
  Invalid

Bug description:
  Test case:
  Do a fresh install of current image (july 19 here
  Boot up, check selected session at the greeter - it will say "ubuntu"
  Log in, ck. env., it will actually be ubuntu-wayland

  Ex.
  $ env | grep -i wayland
  DESKTOP_SESSION=ubuntu-wayland
  WAYLAND_DISPLAY=wayland-0
  XDG_SESSION_TYPE=wayland
  XDG_SESSION_DESKTOP=ubuntu-wayland
  GDMSESSION=ubuntu-wayland

  Test 2:
  From above log out, switch session in greeter to wayland on ubuntu,, switch 
back to ubuntu, login.
  Now you'll be in an ubuntu session

  Test 3:
  log out from above ubuntu session, log into ubuntu-wayland session, reboot.
  At greeter notice it says "ubuntu" selected.
  Login, ck. session. You'll actually be in an ubuntu-wayland session

  ProblemType: Bug
  DistroRelease: Ubuntu 17.10
  Package: ubuntu-session 3.24.1-0ubuntu15
  ProcVersionSignature: Ubuntu 4.11.0-10.15-generic 4.11.8
  Uname: Linux 4.11.0-10-generic x86_64
  ApportVersion: 2.20.5-0ubuntu5
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Tue Jul 18 21:48:10 2017
  InstallationDate: Installed on 2017-07-19 (0 days ago)
  InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170718)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-session
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/gnome-session/+bug/1705157/+subscriptions

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