libgtkglext1 software package provides OpenGL Extension to GTK+ (shared libraries), 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 libgtkglext1
libgtkglext1 is installed in your system.
Make ensure the libgtkglext1 package were installed using the commands given below,
$ sudo dpkg-query -l | grep libgtkglext1 *
You will get with libgtkglext1 package name, version, architecture and description in a table
| Distro | Ubuntu 14 04 lts trusty tahr |
| Section | Libraries |
| Package | libgtkglext1 |
| Version | 1.2.0-3.1fakesync3 |
| Description | OpenGL Extension to GTK+ (shared libraries) |
| Sub Section | libs |