Comment 7 for bug 1295405

(knome pinged me)

While installing the package I compiled (taking from the PPA), I get:

---
update-alternatives: using /usr/share/xgreeters/lightdm-gtk-greeter.desktop to provide /usr/share/xgreeters/lightdm-greeter.desktop (lightdm-greeter) in auto mode
update-alternatives: using /etc/lightdm/lightdm-gtk-greeter-ubuntu.conf to provide /etc/lightdm/lightdm-gtk-greeter.conf (lightdm-gtk-greeter-config-derivative) in auto mode
Setting up lightdm-gtk-greeter-settings (1.1.0-0ubuntu1) ...
  File "/usr/lib/python3/dist-packages/lightdm_gtk_greeter_settings/installation_config.py", line 4
    __version__ = 1.1.0
                      ^
SyntaxError: invalid syntax
---

I'd also add a file debian/lightdm-gtk-greeter-settings.lintian-overrides to override the warnings with the following content:
lightdm-gtk-greeter-settings: binary-without-manpage usr/bin/lightdm-gtk-greeter-settings
lightdm-gtk-greeter-settings: binary-without-manpage usr/bin/lightdm-gtk-greeter-settings-pkexec

So that there are no lintian warnings.

Note that not only you need the package sponsored, the package will go to NEW queue (https://launchpad.net/ubuntu/vivid/+queue?queue_state=0&queue_text=) and will need to be reviewed by an archive admin (https://launchpad.net/~ubuntu-archive/+members).