:~$ dpkg -l | grep dm
ii banshee-extension-soundmenu 2.9.0+really2.6.2-2ubuntu2.1 amd64 Media Management and Playback application - sound menu extension
ii bsdmainutils 9.0.5ubuntu1 amd64 collection of more utilities from FreeBSD
ii dmidecode 2.12-2 amd64 SMBIOS/DMI table decoder
ii dmsetup 2:1.02.77-6ubuntu2 amd64 Linux Kernel Device Mapper userspace library
ii dmz-cursor-theme 0.4.4ubuntu1 all Style neutral, scalable cursor theme
ii geany-plugin-sendmail 1.23+dfsg-3 amd64 mailer plugin for Geany
ii iptables 1.4.21-1ubuntu1 amd64 administration tools for packet filtering and NAT
ii landscape-client-ui-install 14.12-0ubuntu0.14.04 amd64 The Landscape administration system client - UI installer
ii libcrypt-passwdmd5-perl 1.3-10 all interoperable MD5-based crypt() for perl
ii liblightdm-gobject-1-0 1.10.5-0ubuntu1 amd64 LightDM GObject client library
ii libmail-sendmail-perl 0.79.16-1 all Send email from a perl script
ii libquadmath0:amd64 4.8.2-19ubuntu1 amd64 GCC Quad-Precision Math Library
ii libwildmidi-config 0.2.3.4-2.1ubuntu3 all software MIDI player configuration
ii libwildmidi1:amd64 0.2.3.4-2.1ubuntu3 amd64 software MIDI player library
ii libxdmcp-dev:amd64 1:1.1.1-1 amd64 X11 authorisation library (development headers)
ii libxdmcp6:amd64 1:1.1.1-1 amd64 X11 Display Manager Control Protocol library
ii libxdmcp6:i386 1:1.1.1-1 i386 X11 Display Manager Control Protocol library
ii lightdm 1.10.5-0ubuntu1 amd64 Display Manager
ii lightdm-gtk-greeter 2.0.0-0ubuntu1~trusty1 amd64 simple display manager (GTK+ greeter)
ii lightdm-gtk-greeter-settings 1.1.0-0ubuntu1~trusty1 all Settings editor for LightDM Gtk+ Greeter
ii passwd 1:4.1.5.1-1ubuntu9 amd64 change and administer password and group data
ii policykit-1 0.105-4ubuntu2 amd64 framework for managing administrative policies and privileges
ii ubuntu-mate-lightdm-theme 0.3.8~trusty1 all Ubuntu MATE LightDM theme
ii x11proto-xf86vidmode-dev 2.3.1-2 all X11 Video Mode extension wire protocol