$ sudo apt-get update
$ sudo apt-get install androidsdk-uiautomatorviewer 

androidsdk-uiautomatorviewer is installed in your system.

Make ensure the androidsdk-uiautomatorviewer package were installed using the commands given below,

$ sudo dpkg-query -l | grep androidsdk-uiautomatorviewer *

You will get with androidsdk-uiautomatorviewer package name, version, architecture and description in a table

androidsdk-uiautomatorviewer package basic information: