ldm software package provides LTSP display manager, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install ldm
ldm is installed in your system.
Make ensure the ldm package were installed using the commands given below,
$ sudo dpkg-query -l | grep ldm *
You will get with ldm package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Miscellaneous |
| Package | ldm |
| Version | 2:2.2.11-2 |
| Description | LTSP display manager |
| Sub Section | misc |