$ sudo apt-get update
$ sudo apt-get install liblttng-ust-ctl2 

liblttng-ust-ctl2 is installed in your system.

Make ensure the liblttng-ust-ctl2 package were installed using the commands given below,

$ sudo dpkg-query -l | grep liblttng-ust-ctl2 *

You will get with liblttng-ust-ctl2 package name, version, architecture and description in a table

liblttng-ust-ctl2 package basic information: