gob2 software package provides GTK+ Object Builder, you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install gob2
gob2 is installed in your system.
Make ensure the gob2 package were installed using the commands given below,
$ sudo dpkg-query -l | grep gob2 *
You will get with gob2 package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Development |
| Package | gob2 |
| Version | 2.0.20-1 |
| Description | GTK+ Object Builder |
| Sub Section | Devel |