PREUN
/bin/sh
update-alternatives --remove ldm-theme /usr/share/ldm/themes/Mille-xterm
update-alternatives --remove ldm-theme /usr/share/ldm/themes/Ubuntu
update-alternatives --remove ldm-theme /usr/share/ldm/themes/Edubuntu
POSTIN
/bin/sh
update-alternatives --install /usr/share/ldm/themes/default ldm-theme /usr/share/ldm/themes/Mille-xterm 35
update-alternatives --install /usr/share/ldm/themes/default ldm-theme /usr/share/ldm/themes/Ubuntu 40
update-alternatives --install /usr/share/ldm/themes/default ldm-theme /usr/share/ldm/themes/Edubuntu 45