blt software package provides graphics extension library for Tcl/Tk - run-time, 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 blt
blt is installed in your system.
Make ensure the blt package were installed using the commands given below,
$ sudo dpkg-query -l | grep blt *
You will get with blt package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | Libraries |
| Package | blt |
| Version | 2.5.3+dfsg-3 |
| Description | graphics extension library for Tcl/Tk - run-time |
| Sub Section | Libs |