When I stat on my 11.10 machine aptitude search lightdm
I get this:
p gir1.2-lightdm-1 - Typelib file for liblightdm-1
p liblightdm-gobject-1-0 - LightDM GObject client library
p liblightdm-gobject-1-dev - LightDM client library (development files
p liblightdm-gobject-1-doc - LightDM client library (documentation)
p liblightdm-qt-1-0 - LightDM Qt client library
p liblightdm-qt-1-dev - LightDM client library (development files
p lightdm - Display Manager
v lightdm-greeter -
v lightdm-greeter -
v lightdm-greeter-example-gtk -
v lightdm-greeter-example-gtk -
p lightdm-gtk-greeter - LightDM GTK+ Greeter
v lightdm-gtk-greeter-config -
v lightdm-gtk-greeter-config -
p lightdm-qt-greeter - LightDM Qt Greeter
p mythbuntu-lightdm-theme - Mythbuntu LightDM setup
However my system currently runs with lightdm and dpkg -l | grep -i lightdm
says:
ii liblightdm-gobject-1-0 1.0.6-0ubuntu1.6 LightDM GObject client library
ii lightdm 1.0.6-0ubuntu1.6 Display Manager
When I try to install lightdm via apt or via aptitude nothing happens as it seems to be already installed. So I guess aptitude is not working properly?