I'm getting stuck in a login boot loop where the mouse cursor briefly appears and then disappears and a blinking cursor takes its place.

By busting out into a command line, I found the following line in /var/log/lightdm.log

[+3.17s] DEBUG: Seat seat0: Stopping; failed to start a greeter

Then looking at /var/log/lightdm/seat0-greeter.log I found a bunch more problems:

** (lightdm-gtk-greeter:1268): WARNING **: 14:09:11.747: [Background] Failed to load background: Impossible de reconnaître le format d'image du fichier « /usr/share/lubuntu/wallpapers/lubuntu-default-wallpaper.png »

** (lightdm-gtk-greeter:1268): WARNING **: 14:09:11.747: [Background] Failed to read wallpaper: /usr/share/lubuntu/wallpapers/lubuntu-default-wallpaper.png

(lightdm-gtk-greeter:1268): Gtk-WARNING **: 14:09:11.761: Could not load a pixbuf from icon theme.
This may indicate that pixbuf loaders or the mime database could not be found.
**Gtk:ERROR:../../../../gtk/gtkiconhelper.c:494:ensure_surface_for_gicon: assertion failed (error == NULL): Failed to load /usr/share/icons/Lubuntu/mimes/16/image-missing.svg: Format d'image non reconnu (gdk-pixbuf-error-quark, 3)
** Message: 14:09:14.953: Starting lightdm-gtk-greeter 2.0.5 (Mar 20 2018, 09:53:31)
** Message: 14:09:14.955: [Configuration] Reading file: /usr/share/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
** Message: 14:09:14.955: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_lubuntu.conf
** Message: 14:09:14.956: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf

(lightdm-gtk-greeter:1357): dbind-WARNING **: 14:09:15.034: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files

** (lightdm-gtk-greeter:1357): WARNING **: 14:09:15.462: [PIDs] Failed to execute command: /usr/lib/at-spi2-core/at-spi-bus-launcher

** (lightdm-gtk-greeter:1357): WARNING **: 14:09:15.469: [PIDs] Failed to execute command: upstart

I've tried sudo apt install upstart which fails and I'm stumped. How do I fix this?

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