gnome-session-common software package provides GNOME Session Manager - common files, you can install in your Ubuntu 14.04 LTS (Trusty Tahr) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gnome-session-common
gnome-session-common is installed in your system.
Make ensure the gnome-session-common package were installed using the commands given below,
$ sudo dpkg-query -l | grep gnome-session-common *
You will get with gnome-session-common package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | GNOME |
| Package | gnome-session-common |
| Version | 3.9.90-0ubuntu12 |
| Description | GNOME Session Manager - common files |
| Sub Section | GNOME |