Comment 2 for bug 940255

At the time , I was upgrading distro itself
Process stopped with warning , same error as mentioned above

No diversion 'diversion of /etc/lightdm/lightdm-gtk-greeter.conf to /etc/lightdm/lightdm-gtk-greeter.conf.diverted by mythbuntu-default-settings', none removed.
rm: cannot remove `/etc/lightdm/lightdm-gtk-greeter.conf': No such file or directory
dpkg: error processing /var/cache/apt/archives/mythbuntu-lightdm-theme_1.0_all.deb (--unpack):
 subprocess new pre-installation script returned error exit status 1
No apport report written because MaxReports is reached already
                                                              Errors were encountered while processing:
 /var/cache/apt/archives/mythbuntu-lightdm-theme_1.0_all.deb
E: Sub-process /usr/bin/dpkg returned an error code (1)
A package failed to install. Trying to recover: