I get only a purple screen for the background during login. Not even the default warty background. Its been like that since I installed Ubuntu.
Ever since I came to know about the background of the login screen that is supposed to change with the user, I have been trying to activate it. Then I read that it should be activated by default, but since I didn't get any such screen, I searched for solutions.
I followed the steps here.
Still, I couldn't figure out to fix it.
I checked the log files in /var/log/lightdm/
I found these warnings in x-0-greeter.log:
Activating service name='org.a11y.atspi.Registry' [+0.00s] DEBUG: unity-greeter.vala:435: Starting unity-greeter 13.10.3 UID=111 LANG=en_US.UTF-8 [+0.00s] DEBUG: unity-greeter.vala:438: Setting cursor [+0.00s] DEBUG: unity-greeter.vala:452: Loading command line options [+0.00s] DEBUG: unity-greeter.vala:480: Setting GTK+ settings Successfully activated service 'org.a11y.atspi.Registry' ** (at-spi2-registryd:7017): WARNING **: Failed to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files ** (at-spi2-registryd:7017): WARNING **: Unable to register client with session manager [+0.14s] DEBUG: unity-greeter.vala:503: Creating Unity Greeter .... [+0.34s] DEBUG: Starting authentication for user subhrajit... [+0.34s] DEBUG: Wrote 25 bytes to daemon ** (gnome-settings-daemon:7038): WARNING **: Unable to register client: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.gnome.SessionManager was not provided by any .service files [+0.40s] DEBUG: Starting authentication for user subhrajit... .... [+0.54s] DEBUG: background.vala:155: Error loading background: Failed to open file '/home/subhrajit/Pictures/Pictures/HD Wallpapers/Wallpaper 1080 (12).jpg': Permission denied (gnome-settings-daemon:7038): power-plugin-WARNING **: Failed to run GetActive() function on screensaver: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface 'org.gnome.ScreenSaver' on object at path /org/gnome/ScreenSaver [+0.80s] DEBUG: Connected to Application Indicator Service. [+0.81s] DEBUG: unity-greeter.vala:177: starting system-ready sound ** (nm-applet:7055): WARNING **: Could not create object for /org/freedesktop/NetworkManager/Settings/1: uid 111 has no permission to perform this operation ** (nm-applet:7055): WARNING **: handle_property_changed: failed to update property 'available-connections' of object type NMDeviceEthernet. [+0.95s] DEBUG: background.vala:117: Render of background complete .... [+3.69s] DEBUG: Starting session ubuntu [+3.69s] DEBUG: Wrote 18 bytes to daemon ** (gnome-settings-daemon:7038): WARNING **: Name taken or bus went away - shutting down (gnome-settings-daemon:7038): dconf-WARNING **: failed to commit changes to dconf: The connection is closed ** Message: PID 7055 (we are 7055) sent signal 15, shutting down... (nm-applet:7055): libappindicator-WARNING **: Unable to send signal for NewStatus: The connection is closed
Hope this helps.