Comment 7 for bug 140540

The problem appears to be in one of:

capplets-data_1%3a2.19.92-0ubuntu3
gnome-control-center_1%3a2.19.92-0ubuntu3
libgnome2-common_2.20.0-1ubuntu1

based on a script I ran that extracted the cached updates and searched for anything affecting "font_rendering" setting:

/var/cache/apt/archives/capplets-data_1%3a2.19.92-0ubuntu3_all.deb

md5sums:151:ccd5ca5c68af5f75ebff13252d0668d4 usr/share/gconf/schemas/desktop_gnome_font_rendering.schemas
postinst:15: gconf-schemas --register apps_gnome_settings_daemon_default_editor.schemas apps_gnome_settings_daemon_keybindings.schemas apps_gnome_settings_daemon_screensaver.schemas desktop_gnome_font_rendering.schemas fontilus.schemas themus.schemas
postrm:16: SCHEMA_FILES="apps_gnome_settings_daemon_default_editor.schemas apps_gnome_settings_daemon_keybindings.schemas apps_gnome_settings_daemon_screensaver.schemas desktop_gnome_font_rendering.schemas fontilus.schemas themus.schemas "
prerm:5: gconf-schemas --unregister apps_gnome_settings_daemon_default_editor.schemas apps_gnome_settings_daemon_keybindings.schemas apps_gnome_settings_daemon_screensaver.schemas desktop_gnome_font_rendering.schemas fontilus.schemas themus.schemas
usr/share/gconf/schemas/desktop_gnome_font_rendering.schemas:5: <key>/schemas/desktop/gnome/font_rendering/dpi</key>
usr/share/gconf/schemas/desktop_gnome_font_rendering.schemas:6: <applyto>/desktop/gnome/font_rendering/dpi</applyto>
usr/share/gconf/schemas/desktop_gnome_font_rendering.schemas:18: <key>/schemas/desktop/gnome/font_rendering/antialiasing</key>
usr/share/gconf/schemas/desktop_gnome_font_rendering.schemas:19: <applyto>/desktop/gnome/font_rendering/antialiasing</applyto>
usr/share/gconf/schemas/desktop_gnome_font_rendering.schemas:34: <key>/schemas/desktop/gnome/font_rendering/hinting</key>
usr/share/gconf/schemas/desktop_gnome_font_rendering.schemas:35: <applyto>/desktop/gnome/font_rendering/hinting</applyto>
usr/share/gconf/schemas/desktop_gnome_font_rendering.schemas:51: <key>/schemas/desktop/gnome/font_rendering/rgba_order</key>
usr/share/gconf/schemas/desktop_gnome_font_rendering.schemas:52: <applyto>/desktop/gnome/font_rendering/rgba_order</applyto>

/var/cache/apt/archives/gnome-control-center_1%3a2.19.92-0ubuntu3_amd64.deb

Binary file usr/bin/gnome-appearance-properties matches
Binary file usr/bin/gnome-settings-daemon matches
Binary file usr/lib/gnome-control-center/gnome-settings-daemon matches

/var/cache/apt/archives/libgnome2-common_2.20.0-1ubuntu1_all.deb

usr/share/gconf/defaults/10_libgnome2-common:5:/desktop/gnome/font_rendering/dpi 96