Following setup I selected XFCE for her thinking it would be the easiest migration (from Cinnamon.) Unfortunately it seems to have difficulty stopping and restarting the desktop. In other words, if she closed the lid (with power cord connected) when the lid was opened, the screen would remain blank. I could find no way to resolve this except for a complete restart. I could ssh in and restart gdm3 via systemctl and the screen would flicker some text message on the first line of screen. The login screen would not return.
I created a new user to see if it had the same issue. It did. Apparently this did not relate to the configuration files left over from the previous install. (She had been using Cinnamon.)
I also found that if the new (test) user logged into using Gnome and then logged out, it was not possible to log in using XFCE. Instead of opening the user's desktop, it would just return to the display manager (gdm3.)
I've configured my wife's login to use Gnome which does not have this issue but I'm afraid that's going to be a bit much for her to bite off.
Any help resolving this is most welcome.
The only diagnostic I can find is the following message in /var/log/messages
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Feb 27 15:16:12 myrtle /usr/lib/gdm3/gdm-x-session: (II) modeset(0): EDID vendor "LGD", prod id 732
Feb 27 15:16:12 myrtle /usr/lib/gdm3/gdm-x-session: (II) modeset(0): Printing DDC gathered Modelines:
Feb 27 15:16:12 myrtle /usr/lib/gdm3/gdm-x-session: (II) modeset(0): Modeline "1366x768"x0.0 70.00 1366 1402 1450 1492 768 771 776 782 -hsync -vsync (46.9 kHz eP)
Feb 27 15:16:13 myrtle /usr/lib/gdm3/gdm-x-session: process 1343: arguments to dbus_message_new_method_call() were incorrect, assertion "path != NULL" failed in file ../../../dbus/dbus-message.c line 1367.
Feb 27 15:16:13 myrtle /usr/lib/gdm3/gdm-x-session: This is normally a bug in some application using the D-Bus library.